Minor changes

src/index.html

@@ -4,10 +4,14 @@
     <meta charset="utf-8" />
     <title>SDF-2D demo</title>
 
-    <meta property="og:image:width" content="1956" />
-    <meta property="og:image:height" content="937" />
     <meta property="og:url" content="https://sdf2d.schmelczer.dev" />
     <meta property="og:image" content="https://sdf2d.schmelczer.dev/og-image.png" />
+    <meta property="og:image:width" content="1607" />
+    <meta property="og:image:height" content="880" />
+    <meta
+      property="og:image:alt"
+      content="Merging vibrant red blobs lit from below by two flashlights."
+    />
     <meta name="theme-color" content="#103783" />
     <meta
       name="description"
@@ -18,10 +22,16 @@
     <link rel="icon" type="image/png" sizes="32x32" href="favicon-32x32.png" />
     <link rel="icon" type="image/png" sizes="16x16" href="favicon-16x16.png" />
 
-    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta
+      name="viewport"
+      content="width=device-width, initial-scale=1.0, maximum-scale=1.0, 
+    user-scalable=0"
+    />
   </head>
   <body>
-    <noscript>Javascript is required for this website.</noscript>
+    <noscript>
+      <h1>Javascript is required for this website.</h1>
+    </noscript>
 
     <a id="info" href="https://github.com/schmelczerandras/sdf-2d" target="_BLANK">
       <p>SDF-2D</p>