#certificate{padding-top:80px;}
.certificate-list{display:flex;justify-content:space-between;}
.certificate-list li{width:32%;margin-top:15px;}
.certificate-list li img{width:100%;}
@media (max-width:768px){#certificate{padding-top:40px;}
.certificate-list{flex-wrap:wrap}
.certificate-list li{width:100%;margin-top:5px;}}