panes decide how big they should be.

static/index.html

@@ -28,22 +28,18 @@
     }
 
     .left {
-      width: 100px;
       background-color: gray;
     }
 
     .right {
-      width: 100px;
       background-color: green;
     }
 
     .top {
-      height: 100px;
       background-color: purple;
     }
 
     .bottom {
-      height: 100px;
       background-color: blue;
     }