body,
html {
  font-family: PingFangSC-Light, helvetica neue, hiragino sans gb, arial,
    microsoft yahei ui, microsoft yahei, sans-serif;
  width: 100%;
  height: 100%;
}

ul,
li {
  list-style: none;
}

a {
  text-decoration: none;
  color: #aaa;
}

.w {
  width: 1071px;
  margin: 0 auto;
}

.l {
  float: left;
}

.r {
  float: right;
}

.clearfix:after {
  content: '';
  display: block;
  clear: both;
  height: 0;
  visibility: hidden;
}

.clearfix {
  zoom: 1;
}

.flex-center {
  display: flex;
  align-items: center;
}

.row {
  display: flex;
  align-items: center;
}