message: frontend: Allow sidebar to scroll separately from content.
diff: @@ -9,8 +9,8 @@ body {
  font-family: "Source Sans Pro", Helvetica, sans-serif;
  font-size: 16px;
  min-width: 768px;
  - overflow-y: scroll;
  - overflow-x: hidden;
  + overflow-x: auto;
  + overflow-y: hidden;
  }
  #app {
  @@ -25,7 +25,8 @@ body {
  display: flex;
  flex-direction: row;
  flex: 1 0 auto;
  - min-height: 100%;
  + height: 100%;
  + overflow: hidden;
  }
  #sidebar {
  @@ -35,6 +36,9 @@ body {
  display: block;
  width: 220px;
  min-width: 220px;
  + max-width: 220px;
  + overflow-x: hidden;
  + overflow-y: auto;
  }
  #content {
  @@ -42,6 +46,7 @@ body {
  background: white;
  flex-direction: column;
  display: flex;
  + overflow-y: auto;
  }
  #co-l-view-container {
  