滚动条样式

  overflow-y: auto;
  &::-webkit-scrollbar {
    height: 2px;
    width: 6px;
  }
  &::-webkit-scrollbar-thumb {
    border-radius: 5px;
    -webkit-box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    background-color: rgba(255, 255, 255, 0.2);
  }
  &::-webkit-scrollbar-track {
    -webkit-box-shadow: none;
    border-radius: 4px;
    transition: opacity 0.12s ease-out;
    opacity: 0;
  }