body {
  box-sizing: border-box;
  /* height: 5000px; */
}
li {
  list-style: none;
}
a {
  color: black;
}
a:hover {
  text-decoration: none;
}
a:focus {
  text-decoration: none;
}
/* 版心 */
.w {
  width: 1200px;
}
ul {
  padding: 0;
}
.red-round::after {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  background-color: red;
  border-radius: 50%;
  margin-bottom: 13px;
}
/* 外部引入的icon */
.icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.15em;
  fill: currentColor;
  overflow: hidden;
}
select:focus {
  outline: none;
}
input:focus {
  outline: none;
}
.red {
  color: red !important;
}
/* 下虚线 */
.bottom-dotted-line {
  border-bottom: 1px dotted grey;
  color: black;
}
/* 圆点 */
.yuandian {
  position: relative;
  margin: 0 7px;
}
.yuandian::before {
  position: absolute;
  top: 4px;
  left: 0;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background-color: black;
  content: '';
}

button:active {
  outline: none;
}
button:focus {
  outline: none;
}