.code{
  line-height: 1.8;
  font-family: Menlo,Monaco,Consolas,Courier,monospace;
  font-size: 12px;
  padding: 18px 24px;
  background-color: #fafafa;
  border: 1px solid #eaeefb;
  margin-bottom: 25px;
  border-radius: 4px;
  -webkit-font-smoothing: auto;
  border: 1px solid #eaeefb;
}
.h1title{
  margin-left: 1rem;
  margin-bottom: 1rem;
  /*文字不能被选中*/
  user-select: none
}
body{
  margin: 0;
}
/*垂直居中 子元素使用*/
.centerVertical{
  position:relative;
  top:25%;
}
/*水平居中 父元素使用*/
.centerHorizontally{
  text-align:center
}
