diff --git a/src/shell.html b/src/shell.html
index 52bb4b1b4..e6c80a39b 100644
--- a/src/shell.html
+++ b/src/shell.html
@@ -75,6 +75,7 @@ jwE50AGjLCVuS8Yt4H7OgZLKK5EKOsLviEWJSL/+0uMi7gLUSBseYwqEbXvSHCec1CJvZPyHCmYQffaB
       canvas.emscripten {
         border: 0px none;
         background: black;
+        width: 100%;
       }
 
       .spinner {