message: fix(devtools): ui flicker bug (rangle/angular-devtools#49)
diff: font-weight: inherit;
  color: inherit;
  padding: 5px;
  + outline: none;
  }
  .up-down-buttons {
  }
  .up-down-buttons button {
  - width: 25px;
  - height: 25px;
  + width: 24px;
  + height: 24px;
  }
  :host /deep/ .up-down-buttons .mat-icon-button {
  