#certificate .item{position: relative;}
#certificate .item .mask{visibility: hidden; background-color: rgba(111,111,111,0.6);color: #fff;font-size: 2em;position: absolute;top:0;bottom: 0;left:0;right: 0;display: flex;align-items: center;justify-content: center;}
#certificate .item:hover .mask{visibility: visible;}
#main > .bb > .container >div:first-child{background: url(../images/aboutus/line.png) repeat-x center bottom;padding-bottom: 68px!important;}

#howwedoit,#profile{background: url(../images/aboutus/line.png) repeat-x center bottom;padding-bottom: 68px!important;}
@media screen and (max-width: 768px) {
    #profile {flex-direction: column;}
    #profile img{max-width: 100%;}
    
}