Zoom out mobile background 3x for better composition

- Change background-size from cover to 300% on mobile devices
- Makes the image appear 3x further away
- Better composition and less cropped view of the scene

static/css/adaptive-background.css

@@ -6,7 +6,7 @@
     background-image: url('../../images/overlay.png'),
                       linear-gradient(0deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.1)),
                       url('../../images/desktop.webp') !important;
-    background-size: cover;
+    background-size: 300%;
     background-position: center;
     background-attachment: fixed;
   }