.pd-t-b {
  padding: clamp(30px, 3.645833vw, 70px) 0;
}

.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: 20%;
  text-align: center;
  flex: 0 0 20%;
  max-width: 20%;
}

.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: 991px) {
  .pd-t-b {
    padding-top: 25px;
    padding-bottom: 30px;
  }

  .cert-list ul li {
    width: 33.3333%;
    flex: 0 0 33.3333%;
    max-width: 33.3333%;
  }
}



@media screen and (max-width: 767px) {

  .cert-list ul li {
    width: 50%;
    flex: 0 0 50%;
    max-width: 50%;
  }
}