sidebar should only have a flex basis above tablet portrait

opentech/static_src/src/sass/apply/components/_sidebar.scss

 .sidebar {
-    flex-basis: 345px;
     margin-top: 20px;
 
-
     @include media-query(tablet-portrait) {
+        flex-basis: 345px;
         margin: 0 20px 0 0;
     }