diff --git a/src/shell.html b/src/shell.html
index 51e675f43886..cc0552e9f4e1 100644
--- a/src/shell.html
+++ b/src/shell.html
@@ -79,7 +79,7 @@
       canvas.emscripten {
         border: 0px none;
         background: black;
-        width: 100%;
+        /* width: 100%; */
       }
 
       .spinner {
@@ -285,6 +285,10 @@
                 }
 
                 statusElement.innerHTML = text;
+
+                // Temporary workaround for "canvas.emscripten { width: 100%; }" CSS not working with current emscripten (3.1.70)
+                // Revert this change when the issue is fixed upstream
+                document.getElementById('canvas').style.width = '100%';
             },
             totalDependencies: 0,
             monitorRunDependencies: function(left) {