#update-available {
  border-bottom: 1px solid var(--box-border-color);
  height: 30px;

  .close {
      position: absolute;
      right: var(--spacing);

      border: 0;
      height: 16px;
      width: 16px;
      margin: 0;
      padding: 0;
      background: transparent;

      color: var(--text-secondary-color);
      cursor: pointer;
  }
}

#update-available {
  border-bottom: 1px solid var(--box-border-color);
  height: 0px;

  &.active {
    height: 50px;
  }


  .close {
      position: absolute;
      right: var(--spacing);

      border: 0;
      height: 16px;
      width: 16px;
      margin: 0;
      padding: 0;
      background: transparent;

      color: var(--text-secondary-color);
      cursor: pointer;
  }
}

Move height into new class
Move height into new class
