message: Fix timing function for boolean
diff: display: inline-block;
  width: 20px;
  height: 20px;
  - transition-duration: 0.4s;
  + transition-duration: 0.1s;
  transition-property: margin-left;
  + transition-timing-function: linear;
  border: none;
  border-radius: 100%;
  }
  