#back-to-top {
    position: fixed;
    right:80px;
    bottom: 20px;
    z-index: 1001;
    padding: 5px 10px;
    border: 1px solid #D9DBE1;
    border-radius: 5px !important;
    background-color: hsla(0, 0%, 100%, .3);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.05);
}


/*添加按钮*/
.cnblogs-markdown pre {
  position: relative;
}
.cnblogs-markdown pre > span {
  position: absolute;
  top: 0;
  right: 0;
  border-radius: 2px;
  padding: 0 10px;
  font-size: 12px;
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  cursor: pointer;
}
.cnblogs-markdown pre > .copyed {
  background: #67c23a;
}