message: Update color to use variable and fix indentation per code review
diff: background-color: $brand-success;
  border-radius: $border-radius-base $border-radius-base 0 0;
  bottom: 0;
  - color: #fff;
  + color: $color-text-white;
  cursor: pointer;
  padding: 4px 7px;
  position: fixed;
  