.pd-t-b {
  padding-top: 40px;
  padding-bottom: 60px;
}

.ytht-mb-30 {
  margin-bottom: 30px;
}

.cert-list {
  text-align: center;
}

.cert-list ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  margin-left: -1%;
  margin-right: -1%;
}

/* 一行 5 个 */
.cert-list ul li {
  width: 19%;
  margin: 0 1% 30px 1%;
  text-align: center;
}

.cert-list ul li a {
  display: block;
  width: 100%;
  overflow: hidden;
}

.cert-list ul li img {
  width: 100%;
  border: 3px solid #e0e0e0;
  box-sizing: border-box;
  display: block;
}

.cert-list ul li p {
  font-size: 16px;
  margin: 10px 0 0 0;
  color: #252525;
}

@media screen and (max-width: 768px) {
  .pd-t-b {
    padding-top: 25px;
    padding-bottom: 30px;
  }

  /* 移动端一行2个 */
  .cert-list ul li {
    width: 48%;
    margin: 0 1% 20px 1%;
  }
}