message: Remove unused common CSS classes
diff: @@ -489,54 +489,6 @@ input[type=text]:focus, input[type=password]:focus, textarea:focus {
  margin-top: 69px;
  }
  -.mx_Beta {
  - color: red;
  - margin-right: 10px;
  - position: relative;
  - top: -3px;
  - background-color: white;
  - padding: 0 4px;
  - border-radius: 3px;
  - border: 1px solid darkred;
  - cursor: help;
  - transition-duration: 200ms;
  - font-size: smaller;
  - filter: opacity(0.5);
  -}
  -
  -.mx_Beta:hover {
  - color: white;
  - border: 1px solid gray;
  - background-color: darkred;
  -}
  -
  -.mx_TintableSvgButton {
  - position: relative;
  - display: flex;
  - flex-direction: row;
  - justify-content: center;
  - align-content: center;
  -}
  -
  -.mx_TintableSvgButton object {
  - margin: 0;
  - padding: 0;
  - width: 100%;
  - height: 100%;
  - max-width: 100%;
  - max-height: 100%;
  -}
  -
  -.mx_TintableSvgButton span {
  - position: absolute;
  - top: 0;
  - right: 0;
  - bottom: 0;
  - left: 0;
  - opacity: 0;
  - cursor: pointer;
  -}
  -
  // username colors
  // used by SenderProfile & RoomPreviewBar
  .mx_Username_color1 {
  