message: fix double scroll bars with long test suites
diff: .tests {
  max-height: 0;
  - overflow-x: hidden;
  - overflow-y: auto;
  + overflow: hidden;
  transition: max-height 300ms linear;
  list-style: none;
  }
  .tests.active {
  max-height: 500px;
  - transition: max-height 400ms linear;
  + transition: max-height 300ms linear;
  }
  .tests li {
  