.highlight {
  position: relative;
}

/* 用以设置代码块文本样式 */
.highlight pre {
  background-color:#1f1f24;
  border-radius: 8px;
  font-size: 15px;
  line-height: 1.5;
}

/* 鼠标在代码块范围内才显示拷贝按钮 */
.highlight pre:hover + .highlight-copy-btn {
  visibility: visible;
}

/* 用以设置拷贝按钮的样式 */
.highlight-copy-btn {
  visibility: hidden;
  position: absolute;
  top: 7px;
  right: 7px;
  border: 0;
  border-radius: 3px;
  padding: 1px;
  font-size: 0.8em;
  line-height: 1.8;
  color: #fff;
  background-color: #737373;
  min-width: 55px;
  text-align: center;
}

/* 用以设置鼠标hover过拷贝按钮时的样式 */
.highlight-copy-btn:hover {
  visibility: visible;
  background-color: #525252;
}