Update default.html

Author: maxwarnock

_layouts/default.html

@@ -64,7 +64,8 @@
     .top-ribbon {
       position: fixed;
       top: 0;
-      width: 100%;
+      left: 250px;
+      width: calc(100% - 250px);
       background: white;
       padding: 16px 32px;
       box-shadow: 0 4px 12px rgba(0,0,0,0.15);