.pd-t-b {
  padding-top: clamp(30px, 2.083333vw, 40px);
  padding-bottom: clamp(30px, 3.125vw, 60px);
}



.cert-list {
  text-align: center;
  margin: 45px 0 0;
}

.cert-list ul {
  margin: 0 0 0 -2%;
}

/* .cert-list ul li {
  float: left;
  width: 23%;
  margin: 0 0 20px 2%;
  text-align: center;
} */

.pd-t-b .index-tit {
  text-align: center;
}

.pd-t-b .index-tit h2 {
  font-size: clamp(24px, 2.34vw, 45px);
  line-height: 1;
  font-weight: 600;
  color: #0388D1;
}

.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 {
    margin: 25px -10px 0
  }
  
  .ytht-mb-30:not(:last-child)  {
    margin-bottom: 15px;
  }

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