diff --git a/index.html b/index.html
index 879e83e..e267413 100644
--- a/index.html
+++ b/index.html
@@ -70,7 +70,7 @@ npm/codemirror@5.52.0/theme/dracula.min.css
         </div>
         <div id="progress"></div>
         <div id="editor"></div>
-        <footer class="shadow-top container-fluid">
+        <footer id="footer" class="shadow-top container-fluid">
             <div class="row my-1">
                 <div class="col mono" id="stats"></div>
                 <div class="col-auto">
@@ -83,7 +83,7 @@ npm/codemirror@5.52.0/theme/dracula.min.css
                         As a result, there is no risk of data being lost, censored or deleted. The whole data is stored
                         <b>in the link</b> and nowhere else!
                     </div>
-                    <div class="overlay hidden"></div>
+                    <div class="hidden" id="overlay"></div>
                 </div>
                 <div class="col-auto">
                     <a href="https://github.com/bokub/nopaste" rel="noopener" target="_blank">Github</a>
diff --git a/index.js b/index.js
index f1f2a8d..9b5a75e 100644
--- a/index.js
+++ b/index.js
@@ -16,7 +16,7 @@ const init = () => {
 const initCodeEditor = () => {
     const readOnly = new URLSearchParams(window.location.search).has('readonly');
     CodeMirror.modeURL = 'https://cdn.jsdelivr.net/npm/codemirror@5.52.0/mode/%N/%N.js';
-    editor = new CodeMirror(document.getElementById('editor'), {
+    editor = new CodeMirror(byId('editor'), {
         lineNumbers: true,
         theme: 'dracula',
         readOnly: readOnly,
@@ -26,7 +26,7 @@ const initCodeEditor = () => {
         document.body.classList.add('readonly');
     }
 
-    statsEl = document.getElementById('stats');
+    statsEl = byId('stats');
     editor.on('change', () => {
         statsEl.innerHTML = `Length: ${editor.getValue().length} |  Lines: ${editor['doc'].size}`;
     });
@@ -90,16 +90,16 @@ const generateLink = (mode) => {
 
 // Open the "Copy" bar and select the content
 const showCopyBar = (dataToCopy) => {
-    const linkInput = document.getElementById('copy-link');
+    const linkInput = byId('copy-link');
     linkInput.value = dataToCopy;
     linkInput.setSelectionRange(0, dataToCopy.length);
-    document.getElementById('copy').classList.remove('hidden');
+    byId('copy').classList.remove('hidden');
 };
 
 // Close the "Copy" bar
 const hideCopyBar = (success) => {
-    const copyButton = document.getElementById('copy-btn');
-    const copyBar = document.getElementById('copy');
+    const copyButton = byId('copy-btn');
+    const copyBar = byId('copy');
     if (!success) {
         copyBar.classList.add('hidden');
         return;
@@ -118,7 +118,7 @@ const buildUrl = (rawData, mode) => {
         return `[NoPaste snippet](${url})`;
     }
     if (mode === 'iframe') {
-        const height = document.getElementsByClassName('CodeMirror-sizer')[0].clientHeight + 8;
+        const height = editor['doc'].size + 30;
         return `<iframe width="100%" height="${height}" frameborder="0" src="${url}&readonly"></iframe>`;
     }
     return url;
@@ -126,7 +126,7 @@ const buildUrl = (rawData, mode) => {
 
 // Transform a compressed base64 string into a plain text string
 const decompress = (base64, cb) => {
-    const progressBar = document.getElementById('progress');
+    const progressBar = byId('progress');
 
     const req = new XMLHttpRequest();
     req.open('GET', 'data:application/octet;base64,' + base64);
@@ -148,7 +148,7 @@ const decompress = (base64, cb) => {
 
 // Transform a plain text string into a compressed base64 string
 const compress = (str, cb) => {
-    const progressBar = document.getElementById('progress');
+    const progressBar = byId('progress');
 
     lzma.compress(
         str,
@@ -181,6 +181,8 @@ const slugify = (str) =>
         .replace(/#/g, '-sharp')
         .replace(/[^\w\-]+/g, '');
 
+const byId = (id) => document.getElementById(id);
+
 /* Only for tests purposes */
 const testAllModes = () => {
     for (const [index, language] of Object.entries(CodeMirror.modeInfo)) {
diff --git a/style.css b/style.css
index f90cdc0..fa0a540 100644
--- a/style.css
+++ b/style.css
@@ -1,9 +1,12 @@
 /* App layout */
 
+html,
+body {
+    height: 100%;
+}
 body {
     display: flex;
     flex-flow: column;
-    height: 100vh;
     color: #fff;
     font: normal 14px Roboto, sans-serif;
     background-color: #282a36;
@@ -73,7 +76,7 @@ a:active {
     right: 0;
     max-width: 350px;
 }
-.description-trigger:hover + #description + .overlay {
+.description-trigger:hover + #description + #overlay {
     /* Used to un-hover on mobile */
     display: block;
     position: fixed;