@keyframes dow_arr1 {
  0% {
    opacity: 0;
  }
  24% {
    opacity: 0;
  }
  25% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes dow_arr2 {
  0% {
    opacity: 0;
  }
  49% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes large-s {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.05);
  }
}
.ctn_1 {
  width: 100%;
  overflow: hidden;
  margin-top: -10%;
  position: relative;
  z-index: 5;
  padding-bottom: 4rem;
}
.ctn_1 .w1280 {
  background-position: top center;
  background-repeat: no-repeat;
  background-size: 100%;
  background-color: #fbfbfb;
}
.ctn_1 .tab {
  width: 100%;
  margin: 1rem 0;
  padding: 5px;
  background-color: #fff;
  border-radius: 100px;
  box-shadow: 0px 0px 15px #efefef;
  text-align: center;
}
.ctn_1 .tab a {
  display: inline-block;
  padding: 8px 40px;
  border-radius: 100px;
  background-color: #F5F5F5;
  color: #808080;
  margin: 0 2%;
  font-size: 14px;
  line-height: 1.5;
}
.ctn_1 .tab a.on {
  background-color: #7B191F;
  color: #fff;
}
.ctn_1 .certificate {
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
  width: 96%;
  margin: 2.5rem auto 0;
}
.ctn_1 .certificate li {
  width: 18%;
  margin: 0 1% 2rem;
}
.ctn_1 .certificate li .img {
  width: 100%;
  position: relative;
  padding-top: 74%;
  overflow: hidden;
  box-shadow: 0px 13px 12px #ccc;
}
.ctn_1 .certificate li .img img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.3s;
}
.ctn_1 .certificate li:hover .img img {
  transform: translate(-50%, -50%) scale(1.05);
}
.ctn_1 .certificate li:hover .txt {
  color: #7B191F;
}
.ctn_1 .certificate li .txt {
  text-align: center;
  color: #808080;
  font-size: 14px;
  line-height: 1.5;
  margin-top: 1rem;
}
@media screen and (max-width: 1280px) {
  .ctn_1 .certificate li {
    width: 23%;
  }
}
@media screen and (max-width: 900px) {
  .ctn_1 .certificate li {
    width: 48%;
  }
}
@media screen and (max-width: 768px) {
  .ctn_1 .tab a {
    padding: 6px 22px;
  }
}