message: darkened caption color slightly to meet contrast requirement
diff: @@ -215,3 +215,10 @@ footer {
  position: absolute !important;
  word-wrap: normal !important;
  }
  +
  +
  +/* fixing https://github.com/microsoft/FluidFramework/issues/3821
  +where bootstrap caption color is too light for white background */
  +.table caption {
  + color: #767676
  +}
  