// 代码块复制按钮
if hexo-config('copy_btn') == true
  .highlight
    position: relative

  .btn-copy
    z-index: 1
    display: inline-block
    cursor: pointer
    border: none
    disable-user-select()
    -webkit-appearance: none
    font-size: 12px
    font-weight: bold
    padding: 3px 6px
    >i
      margin-right: 4px
      font-size: 10px
      transform: translateY(1px);
    color: #333
    background: rgba(255,255,255,.8)
    border-radius: 2px
    position: absolute
    top: 0
    right: 0
    opacity: 0
    transition: all linear .2s
    &:hover
      background: rgba(255,255,255,.7)

  .highlight:hover .btn-copy
    opacity: 1

  .article pre:hover .btn-copy
    opacity: 1