diff --git a/app.js b/app.js
index 3a0d349..4a52f3a 100644
--- a/app.js
+++ b/app.js
@@ -8,49 +8,49 @@ const NOW = new Date();
 const timeTable = {};
 
 function roomStatus(room, callback) {
-    return new Promise((resolve, _) => {
-        const xhr = new XMLHttpRequest();
-        xhr.addEventListener('load', () => {
-            const parser = new DOMParser();
-            const doc = parser.parseFromString(xhr.responseText, 'text/html');
-            const lessons = doc.querySelectorAll(
-                'table.rsContentTable div.rsAptSimple');
-            const parsed = [];
+  return new Promise((resolve, _) => {
+    const xhr = new XMLHttpRequest();
+    xhr.addEventListener('load', () => {
+      const parser = new DOMParser();
+      const doc = parser.parseFromString(xhr.responseText, 'text/html');
+      const lessons = doc.querySelectorAll(
+        'table.rsContentTable div.rsAptSimple');
+      const parsed = [];
 
-            for (let lesson of lessons) {
-                const time = lesson.querySelector('span[id$=lblOrario]');
-                const start = new Date();
-                start.setHours(parseInt(time.innerText.substring(1,3)));
-                start.setMinutes(parseInt(time.innerText.substring(4,6)));
-                start.setSeconds(0);
+      for (let lesson of lessons) {
+        const time = lesson.querySelector('span[id$=lblOrario]');
+        const start = new Date();
+        start.setHours(parseInt(time.innerText.substring(1,3)));
+        start.setMinutes(parseInt(time.innerText.substring(4,6)));
+        start.setSeconds(0);
 
-                const end = new Date();
-                end.setHours(parseInt(time.innerText.substring(7,9)));
-                end.setMinutes(parseInt(time.innerText.substring(10,12)));
-                end.setSeconds(0);
+        const end = new Date();
+        end.setHours(parseInt(time.innerText.substring(7,9)));
+        end.setMinutes(parseInt(time.innerText.substring(10,12)));
+        end.setSeconds(0);
 
-                parsed.push({
-                    title: lesson.getAttribute('title'),
-                    start: start,
-                    end: end
-                });
-            }
-
-            resolve(parsed);
+        parsed.push({
+          title: lesson.getAttribute('title'),
+          start: start,
+          end: end
         });
-        xhr.open('GET', URL + room);
-        xhr.send();
+      }
+
+      resolve(parsed);
     });
+    xhr.open('GET', URL + room);
+    xhr.send();
+  });
 }
 
 const ROOMS = [
-    'SI-003',
-    'SI-015',
-    'SI-004',
-    'SI-006',
-    'SI-013',
-    'SI-007',
-    'SI-008',
+  'SI-003',
+  'SI-015',
+  'SI-004',
+  'SI-006',
+  'SI-013',
+  'SI-007',
+  'SI-008',
 ];
 
 const ROOM_LIST = document.querySelector(".times");
@@ -59,100 +59,97 @@ const SLOT_TEMPLATE = document.getElementById("time-slot");
 const FREE_SLOT_TEMPLATE = document.getElementById("time-free");
 
 function getRoomNode() {
-    return document.importNode(ROOM_TEMPLATE.content, true);
+  return document.importNode(ROOM_TEMPLATE.content, true);
 }
 
 function formatTime(date) {
-    const twoDigits = (n) => {
-        return n < 10 ? "0" + n : n;
-    }
+  const twoDigits = (n) => {
+    return n < 10 ? "0" + n : n;
+  }
 
-    return twoDigits(date.getHours()) + ':' +
-        twoDigits(date.getMinutes());
+  return twoDigits(date.getHours()) + ':' +
+    twoDigits(date.getMinutes());
 }
 
 function colorRoom(roomTitle, node, time = NOW /* QuantumLeap */) {
-    const data = timeTable[roomTitle];
-    if (data == undefined) {
-        return
-    }
+  const data = timeTable[roomTitle];
+  if (data == undefined) {
+    return
+  }
 
-    const currentLecture = data.filter(d => d.start < time && d.end > time)[0];
-    const isFree = currentLecture === void(0);
-    const block = document.getElementById(roomTitle);
+  const currentLecture = data.filter(d => d.start < time && d.end > time)[0];
+  const isFree = currentLecture === void(0);
+  const block = document.getElementById(roomTitle);
 
-    block.className = block.className.replace(" room-in-use", "")
-        .replace(" room-free", "");
-    block.className += isFree ? " room-free" : " room-in-use";
+  block.className = block.className.replace(" room-in-use", "")
+    .replace(" room-free", "");
+  block.className += isFree ? " room-free" : " room-in-use";
 
-    block.querySelector('p').innerHTML = isFree ? 'Free' :
-        currentLecture.title + "<br> (" + formatTime(currentLecture.start) + " - " +
-        formatTime(currentLecture.end) + ")";
+  block.querySelector('p').innerHTML = isFree ? 'Free' :
+    currentLecture.title + "<br> (" + formatTime(currentLecture.start) + " - " +
+    formatTime(currentLecture.end) + ")";
 }
 
 async function buildRoomMarkup(roomTitle) {
-    const data = await roomStatus(roomTitle);
-    const room = getRoomNode();
-    const title = room.querySelector('.room-title');
-    title.innerHTML = roomTitle;
-    title.id = "schedule-" + roomTitle;
-    const list = room.querySelector('.list');
+  const data = await roomStatus(roomTitle);
+  const room = getRoomNode();
+  const title = room.querySelector('.room-title');
+  title.innerHTML = roomTitle;
+  title.id = "schedule-" + roomTitle;
+  const list = room.querySelector('.list');
 
-    for (const d of data) {
-        const slot = document.importNode(SLOT_TEMPLATE.content, true);
-        const title = slot.querySelector('.title');
-        title.innerHTML = d.title;
-        const start = slot.querySelector('.start');
-        start.innerHTML = formatTime(d.start);
-        const end = slot.querySelector('.end');
-        end.innerHTML = formatTime(d.end);
-        list.appendChild(slot);
-    }
+  for (const d of data) {
+    const slot = document.importNode(SLOT_TEMPLATE.content, true);
+    const title = slot.querySelector('.title');
+    title.innerHTML = d.title;
+    const start = slot.querySelector('.start');
+    start.innerHTML = formatTime(d.start);
+    const end = slot.querySelector('.end');
+    end.innerHTML = formatTime(d.end);
+    list.appendChild(slot);
+  }
 
-    timeTable[roomTitle] = data;
-    colorRoom(roomTitle, room);
+  timeTable[roomTitle] = data;
+  colorRoom(roomTitle, room);
 
-    if (data.length == 0) {
-        list.appendChild(document.importNode(FREE_SLOT_TEMPLATE.content, true));
-    }
+  if (data.length == 0) {
+    list.appendChild(document.importNode(FREE_SLOT_TEMPLATE.content, true));
+  }
 
-    ROOM_LIST.appendChild(room);
+  ROOM_LIST.appendChild(room);
 }
 
 function setTimePreview(date) {
-    const timePreview = document.getElementById('timepreviewer');
-    timePreview.innerText = "Time: " + formatTime(date);
+  const timePreview = document.getElementById('timepreviewer');
+  timePreview.innerText = "Time: " + formatTime(date);
 }
 
 function setupTimeMachine() {
-    const slider = document.getElementById('timemachine');
-    slider.min = 8 * 60 + 30;
-    slider.max = 19 * 60 + 30;
-
-    slider.addEventListener("input", (e) => {
-        const date = new Date();
-        date.setHours(0);
-        date.setMinutes(slider.value);
-        const node = getRoomNode();
-
-        setTimePreview(date);
-
-        ROOMS.forEach((roomTitle) => {
-            colorRoom(roomTitle, node, date);
-        });
-    });
+  const slider = document.getElementById('timemachine');
+  slider.min = 8 * 60 + 30;
+  slider.max = 19 * 60 + 30;
 
+  slider.addEventListener("input", (e) => {
     const date = new Date();
-    const mins = date.getHours() * 60 + date.getMinutes();
-    slider.value = mins < slider.min ? slider.min :
-      mins > slider.max ? slider.max : mins;
+    date.setHours(0);
+    date.setMinutes(slider.value);
+    const node = getRoomNode();
+
     setTimePreview(date);
+
+    ROOMS.forEach((roomTitle) => {
+      colorRoom(roomTitle, node, date);
+    });
+  });
+
+  const date = new Date();
+  const mins = date.getHours() * 60 + date.getMinutes();
+  slider.value = mins < slider.min ? slider.min :
+    mins > slider.max ? slider.max : mins;
+  setTimePreview(date);
 }
 
-(async () => {
-    for (const room of ROOMS) {
-        await buildRoomMarkup(room);
-    }
-})();
+// Thanks to Andrea Gallidabino and his mastery checks for this
+Promise.all(ROOMS.map(buildRoomMarkup)).catch(console.error);
 
 setupTimeMachine();
diff --git a/assets/index.css b/assets/index.css
index 5e013f9..1681145 100644
--- a/assets/index.css
+++ b/assets/index.css
@@ -1,4 +1,5 @@
 /* Inter font */
+/* vim: set ts=2 sw=2 et tw=80: */
 
 @font-face {
   font-family: 'Inter';
@@ -6,7 +7,7 @@
   font-weight: 400;
   font-display: swap;
   src: url("fonts/Inter-Regular.woff2") format("woff2"),
-       url("fonts/Inter-Regular.woff") format("woff");
+  url("fonts/Inter-Regular.woff") format("woff");
 }
 
 @font-face {
@@ -15,243 +16,243 @@
   font-weight: 800;
   font-display: swap;
   src: url("fonts/Inter-ExtraBold.woff2") format("woff2"),
-       url("fonts/Inter-ExtraBold.woff") format("woff");
+  url("fonts/Inter-ExtraBold.woff") format("woff");
 }
 
 /* Base */
 
 * {
-    font-family: 'Inter', sans-serif;
-    color: #212529;
+  font-family: 'Inter', sans-serif;
+  color: #212529;
 }
 
 h1 {
-    text-align: center;
-    width: 100%;
+  text-align: center;
+  width: 100%;
 }
 
 h2 {
-    text-align: center;
-    width: 100%;
+  text-align: center;
+  width: 100%;
 }
 
 /* Slider */
 
 input[type=range] {
-    -webkit-appearance: none;
-    border: 0;
-    height: 28px;
-    margin: 8px 0;
-    outline: none;
-    padding: 0 8px;
-    width: 100%;
+  -webkit-appearance: none;
+  border: 0;
+  height: 28px;
+  margin: 8px 0;
+  outline: none;
+  padding: 0 8px;
+  width: 100%;
 }
 
 input[type="range"]::-webkit-slider-runnable-track {
-    background: #b1b1bc;
-    border-radius: 2px;
-    height: 4px;
+  background: #b1b1bc;
+  border-radius: 2px;
+  height: 4px;
 }
 
 input[type="range"]::-moz-range-track {
-    background: #b1b1bc;
-    height: 4px;
+  background: #b1b1bc;
+  height: 4px;
 }
 
 input[type="range"]::-webkit-slider-thumb {
-    -webkit-appearance: none;
-    background: #212529;
-    border: 4px solid #ededf0;
-    border-radius: 50%;
-    cursor: pointer;
-    height: 28px;
-    margin-top: -12px;
-    width: 28px;
+  -webkit-appearance: none;
+  background: #212529;
+  border: 4px solid #ededf0;
+  border-radius: 50%;
+  cursor: pointer;
+  height: 28px;
+  margin-top: -12px;
+  width: 28px;
 }
 
 input[type="range"]::-moz-range-thumb {
-    background: #212529;
-    border: 4px solid #ededf0;
-    border-radius: 50%;
-    cursor: pointer;
-    height: 20px;
-    width: 20px;
+  background: #212529;
+  border: 4px solid #ededf0;
+  border-radius: 50%;
+  cursor: pointer;
+  height: 20px;
+  width: 20px;
 }
 
 input[type="range"]::-moz-focus-outer {
-    border: 0;
+  border: 0;
 }
 
 input[type="range"]::-moz-range-progress {
-    background: #212529;
-    border-radius: 4px;
-    height: 4px;
+  background: #212529;
+  border-radius: 4px;
+  height: 4px;
 }
 
 /* Room map */
 
 .room-map {
-    display: flex;
-    flex-direction: row;
-    flex-wrap: wrap;
-    padding-left: 10vw;
-    padding-right: 10vw;
-    text-align: center;
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  padding-left: 10vw;
+  padding-right: 10vw;
+  text-align: center;
 }
 
 .room {
-    margin: 0.5rem;
-    background: #ededf0;
-    border-radius: 6px;
-    padding: 0.5rem;
-    transition: all 0.5s ease;
+  margin: 0.5rem;
+  background: #ededf0;
+  border-radius: 6px;
+  padding: 0.5rem;
+  transition: all 0.5s ease;
 }
 
 .room:hover {
-    box-shadow: 0 4px 8px #0000002a;
+  box-shadow: 0 4px 8px #0000002a;
 }
 
 .room a {
-    text-decoration: none;
+  text-decoration: none;
 }
 
 .room h3 {
-    font-size: 1.6rem;
-    font-weight: 700;
+  font-size: 1.6rem;
+  font-weight: 700;
 }
 
 .room p {
-    font-size: 1.2rem;
+  font-size: 1.2rem;
 }
 
 .room-big {
-    flex: 1 1 100%;
+  flex: 1 1 100%;
 }
 
 .room-small {
-    flex: 1 1 45%;
+  flex: 1 1 45%;
 }
 
 .room-free {
-    background-color: #3FE1B0;
+  background-color: #3FE1B0;
 }
 
 .room-in-use {
-    background-color: #FF505F;
+  background-color: #FF505F;
 }
 
 @media screen and (max-width: 830px) {
-    .room {
-        padding: 0.2rem;
-    }
+  .room {
+    padding: 0.2rem;
+  }
 
-    .room-big {
-        flex: 1 1 80%;
-    }
+  .room-big {
+    flex: 1 1 80%;
+  }
 
-    .room-small {
-        flex: 1 1 35%;
-    }
+  .room-small {
+    flex: 1 1 35%;
+  }
 }
 
 /* Time */
 .timepicker {
-    border: #00000033 solid 1px;
-    border-radius: 6px;
-    box-shadow: 0 1px 3px #0000001a;
-    display: flex;
-    flex-direction: column;
-    padding: 1rem;
-    margin: 2rem 5vw;
-    text-align: center;
+  border: #00000033 solid 1px;
+  border-radius: 6px;
+  box-shadow: 0 1px 3px #0000001a;
+  display: flex;
+  flex-direction: column;
+  padding: 1rem;
+  margin: 2rem 5vw;
+  text-align: center;
 }
 
 /* Schedule */
 
 .schedule {
-    border: #00000033 solid 1px;
-    border-radius: 6px;
-    box-shadow: 0 1px 3px #0000001a;
-    padding: 1rem;
-    margin: 2rem 5vw;
+  border: #00000033 solid 1px;
+  border-radius: 6px;
+  box-shadow: 0 1px 3px #0000001a;
+  padding: 1rem;
+  margin: 2rem 5vw;
 }
 
 .schedule h2 {
-    font-weight: 800;
-    text-align: start;
+  font-weight: 800;
+  text-align: start;
 }
 
 /* Dark mode */
 
 @media(prefers-color-scheme: dark) {
-    * {
-        color: #f9f9fa;
-    }
+  * {
+    color: #f9f9fa;
+  }
 
-    body {
-        background: #212529;
-    }
+  body {
+    background: #212529;
+  }
 
-    input[type="range"] {
-        background-color: #2d3339;
-    }
+  input[type="range"] {
+    background-color: #2d3339;
+  }
 
-    input[type="range"]::-webkit-slider-runnable-track {
-        background: #7a7a8b;
-    }
+  input[type="range"]::-webkit-slider-runnable-track {
+    background: #7a7a8b;
+  }
 
-    input[type="range"]::-moz-range-track {
-        background: #7a7a8b;
-    }
+  input[type="range"]::-moz-range-track {
+    background: #7a7a8b;
+  }
 
-    input[type="range"]::-webkit-slider-thumb {
-        background: #f9f9fa;
-        border: 4px solid #5e5e72;
-    }
+  input[type="range"]::-webkit-slider-thumb {
+    background: #f9f9fa;
+    border: 4px solid #5e5e72;
+  }
 
-    input[type="range"]::-moz-range-thumb {
-        background: #f9f9fa;
-        border: 4px solid #5e5e72;
-    }
+  input[type="range"]::-moz-range-thumb {
+    background: #f9f9fa;
+    border: 4px solid #5e5e72;
+  }
 
-    input[type="range"]::-moz-range-progress {
-        background: #f9f9fa;
-    }
+  input[type="range"]::-moz-range-progress {
+    background: #f9f9fa;
+  }
 
-    .room {
-        margin: 0.5rem;
-        background: #2d3339;
-        border-radius: 6px;
-        padding: 0.5rem;
-        transition: all 0.5s ease;
-    }
+  .room {
+    margin: 0.5rem;
+    background: #2d3339;
+    border-radius: 6px;
+    padding: 0.5rem;
+    transition: all 0.5s ease;
+  }
 
 
-    .room-free {
-        background-color: #3FE1B0;
-    }
+  .room-free {
+    background-color: #3FE1B0;
+  }
 
-    .room-free:hover {
-        box-shadow: 0 4px 8px #b3ffe333;
-    }
+  .room-free:hover {
+    box-shadow: 0 4px 8px #b3ffe333;
+  }
 
-    .room-in-use {
-        background-color: #ff6a75;
-    }
+  .room-in-use {
+    background-color: #ff6a75;
+  }
 
-    .room-in-use:hover {
-        box-shadow: 0 4px 8px #ff6a7533;
-    }
+  .room-in-use:hover {
+    box-shadow: 0 4px 8px #ff6a7533;
+  }
 
-    .timepicker {
-        border: #384047 solid 1px;
-        background-color: #2d3339;
-        box-shadow: 0 0 0 #00000000;
-    }
+  .timepicker {
+    border: #384047 solid 1px;
+    background-color: #2d3339;
+    box-shadow: 0 0 0 #00000000;
+  }
 
-    .schedule {
-        border: #384047 solid 1px;
-        background-color: #2d3339;
-        box-shadow: 0 0 0 #00000000;
-    }
+  .schedule {
+    border: #384047 solid 1px;
+    background-color: #2d3339;
+    box-shadow: 0 0 0 #00000000;
+  }
 }
diff --git a/index.html b/index.html
index 9860e6a..fae207f 100644
--- a/index.html
+++ b/index.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <!-- vim: set ts=2 sw=2 et tw=80: -->
 <html>
-<head>
+  <head>
     <meta charset='utf-8'>
     <title>USI • Rooms availability</title>
 
@@ -10,86 +10,86 @@
     <link rel="icon" href="assets/images/icon-64.png">
     <link rel="manifest" href="manifest.json">
     <link rel="stylesheet" href="assets/index.css">
-</head>
-<body>
+  </head>
+  <body>
     <h1>USI INF room availability</h1>
 
     <div class="timepicker">
-        <h2 id="timepreviewer">Loading...</h2>
-        <input type="range" id="timemachine" />
+      <h2 id="timepreviewer">Loading...</h2>
+      <input type="range" id="timemachine" />
     </div>
 
     <div class="room-map">
-        <div class="room room-big" id="SI-003">
-            <a href="#schedule-SI-003">
-                <h3>SI-003</h3>
-                <p>???</p>
-            </a>
-        </div>
-        <!-- Row -->
-        <div class="room room-small" id="SI-015">
-            <a href="#schedule-SI-015">
-                <h3>SI-015</h3>
-                <p>???</p>
-            </a>
-        </div>
-        <div class="room room-small" id="SI-004">
-            <a href="#schedule-SI-004">
-                <h3>SI-004</h3>
-                <p>???</p>
-            </a>
-        </div>
-        <!-- Row -->
-        <div class="room room-big" id="SI-006">
-            <a href="#schedule-SI-006">
-                <h3>SI-006</h3>
-                <p>???</p>
-            </a>
-        </div>
-        <!-- Row -->
-        <div class="room room-small" id="SI-013">
-            <a href="#schedule-SI-013">
-                <h3>SI-013</h3>
-                <p>???</p>
-            </a>
-        </div>
-        <div class="room room-small" id="SI-007">
-            <a href="#schedule-SI-007">
-                <h3>SI-007</h3>
-                <p>???</p>
-            </a>
-        </div>
-        <!-- Row -->
-        <div class="room room-big room" id="SI-008">
-            <a href="#schedule-SI-008">
-                <h3>SI-008</h3>
-                <p>???</p>
-            </a>
-        </div>
+      <div class="room room-big" id="SI-003">
+        <a href="#schedule-SI-003">
+          <h3>SI-003</h3>
+          <p>???</p>
+        </a>
+      </div>
+      <!-- Row -->
+      <div class="room room-small" id="SI-015">
+        <a href="#schedule-SI-015">
+          <h3>SI-015</h3>
+          <p>???</p>
+        </a>
+      </div>
+      <div class="room room-small" id="SI-004">
+        <a href="#schedule-SI-004">
+          <h3>SI-004</h3>
+          <p>???</p>
+        </a>
+      </div>
+      <!-- Row -->
+      <div class="room room-big" id="SI-006">
+        <a href="#schedule-SI-006">
+          <h3>SI-006</h3>
+          <p>???</p>
+        </a>
+      </div>
+      <!-- Row -->
+      <div class="room room-small" id="SI-013">
+        <a href="#schedule-SI-013">
+          <h3>SI-013</h3>
+          <p>???</p>
+        </a>
+      </div>
+      <div class="room room-small" id="SI-007">
+        <a href="#schedule-SI-007">
+          <h3>SI-007</h3>
+          <p>???</p>
+        </a>
+      </div>
+      <!-- Row -->
+      <div class="room room-big room" id="SI-008">
+        <a href="#schedule-SI-008">
+          <h3>SI-008</h3>
+          <p>???</p>
+        </a>
+      </div>
     </div>
 
     <div class="schedule">
-        <h1>Schedule for today</h1>
-        <section class="times">
-        </section>
+      <h1>Schedule for today</h1>
+      <section class="times">
+      </section>
 
-        <template id="room">
-            <h2 class="room-title"></h2>
-            <ul class="list"></ul>
-        </template>
+      <template id="room">
+        <h2 class="room-title"></h2>
+        <ul class="list"></ul>
+      </template>
 
-        <template id="time-free">
-            <li><strong>Free all day</strong></li>
-        </template>
+      <template id="time-free">
+        <li><strong>Free all day</strong></li>
+      </template>
 
-        <template id="time-slot">
-            <li>
-                <span class="title"></span>
-                (<span class="start"></span>-<span class="end"></span>)
-            </li>
-        </template>
+      <template id="time-slot">
+        <li>
+          <span class="title"></span>
+          (<span class="start"></span>-<span class="end"></span>)
+        </li>
+      </template>
     </div>
 
     <script src='app.js'></script>
- </body>
+  </body>
 </html>
diff --git a/manifest.json b/manifest.json
index f5b0adf..3413bf6 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,21 +1,23 @@
 {
-    "short_name": "USI Rooms",
-    "name": "USI INF Rooms",
-    "icons": [
-        {
-            "src": "./assets/images/icon-192.png",
-            "type": "image/png",
-            "sizes": "192x192"
-        },
-        {
-            "src": "./assets/images/icon-512.png",
-            "type": "image/png",
-            "sizes": "512x512"
-        }
-    ],
-    "start_url": "./index.html",
-    "background_color": "#fafafa",
-    "display": "standalone",
-    "scope": "./",
-    "theme_color": "#333333"
+  "_modeline": " vim: set ts=2 sw=2 et tw=80:",
+
+  "short_name": "USI Rooms",
+  "name": "USI INF Rooms",
+  "icons": [
+    {
+      "src": "./assets/images/icon-192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "./assets/images/icon-512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": "./index.html",
+  "background_color": "#fafafa",
+  "display": "standalone",
+  "scope": "./",
+  "theme_color": "#333333"
 }