.nav {
  display: flex;
  justify-content: center;
  font-size: 0;
  margin-bottom: 0.36rem;
}
.nav ul {
  display: flex;
}
.nav ul li > a {
  text-decoration: none;
  /* 去除下划线 */
  outline: none;
  /* 移除点击时的外轮廓 */
  display: flex;
  align-content: center;
  justify-content: center;
  flex-wrap: wrap;
  width: 1rem;
  margin-right: 0.66rem;
  box-sizing: border-box;
}
.nav ul li > a > img {
  width: 1rem;
  height: 1rem;
  box-shadow: 0px 2px 4px -2px rgba(0, 0, 0, 0.06), 0px 4px 8px -2px rgba(0, 0, 0, 0.1);
  border-radius: 0.16rem;
}
.nav ul li > a > span {
  display: inline-block;
  margin-top: 0.08rem;
  width: 100%;
  font-size: 0.24rem;
  font-weight: 500;
  color: #333;
  text-align: center;
}
.nav ul li:nth-child(4n+0) > a {
  margin-right: 0;
}