message: improve tools styling
  we don't need the media queries anymore, that was only necessary based on an earlier CSS layout before ember-toolbars.
  And we need a visual separation between white section in the sidebar and document
diff: height: 100vh;
  /* no margin collapse */
  - padding: 0.1px;
  -}
  + padding-top: 0.1px;
  + padding-bottom: 0.1px;
  -.cardstack-toolbox-width {
  - width: 41.0vw;
  -}
  -@media (min-width: 1000px) {
  - .cardstack-toolbox-width {
  - width: 34.0vw;
  - }
  -}
  -@media (min-width: 1250px) {
  - .cardstack-toolbox-width {
  - width: 25.0vw;
  + padding-left: 1px;
  + background-color: var(--deep-background);
  }
  -}
  -@media (min-width: 1563px) {
  - .cardstack-toolbox-width {
  - width: 16.0vw;
  - }
  -}
  -@media (min-width: 1923px) {
  +
  .cardstack-toolbox-width {
  - width: 7.0vw;
  - }
  + width: 20rem;
  }
  