.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 0 0 -2%;
}

/* .cert-list ul li {
  float: left;
  width: 23%;
  margin: 0 0 20px 2%;
  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) {
  .main {
    padding-top: 25px;
    padding-bottom: 30px;
  }

  /* .cert-list ul li {
    width: 48%;
    margin: 0 0 15px 2%;
  } */
}