diff --git a/server_config/error50x.html b/server_config/error50x.html
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--- /dev/null
+++ b/server_config/error50x.html
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+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Yellow Lab Tools</title>
+    <base href="/">
+    <link rel="icon" type="image/png" href="img/favicon.fc00a056.png">
+    <meta property="og:image" content="img/logo-large.fa6ac0e9.png">
+    <meta name="description" content="Free online web performance tool. Audit your webpage for performance and front-end quality issues. And it's open-source!">
+    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+</head>
+<body>
+    <div id="header">
+        <h1>Yellow Lab <span class="icon-lab"></span> Tools</h1>
+    </div>
+    <div id="body" autoscroll="true" class="" style="">
+        <div>
+            <div>
+                <div class="status">Sorry, Yellow Lab Tools looks broken :/</div>
+                <p class="statusSubMessage">The admin has been alerted. You can still use the tool below in the meanwhile ↓</p>
+            </div>
+        </div>
+        <br>
+        <br>
+        <div style="font-size:.9em">Test your website for free and get <b>additional insights</b> with our sponsor: <a href="https://www.dareboost.com/en?utm_source=yellowlabtools&amp;utm_medium=cpm&amp;utm_campaign=loading" style="color:inherit"><b>dareboost.com</b></a></div>
+    </div>
+    <div class="footer">
+        <div class="github">
+            <iframe id="ghbtn" frameborder="0" scrolling="0" width="145px" height="30px" src="https://ghbtns.com/github-btn.html?user=gmetais&amp;repo=YellowLabTools&amp;type=star&amp;count=true&amp;size=large"></iframe>
+        </div>
+    </div>
+</body>
+</html>
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