.about-img lite-youtube {max-width:100%;height:100%}
@media (max-width:768px){.about .about-con{padding-top:56vw}}

.que-item:first-of-type{background: #fff;}
.que-item:first-of-type .que-num,.que-item:first-of-type .que-title{color: #000;}
.que .que-item:first-of-type .more-btn,.que .que-item:first-of-type article{color: #000;}
.que .que-item:first-of-type .more-btn i,.que .que-item:first-of-type .more-btn em{background: #000;color: #fff;}
.que .que-item:first-of-type .more-btn i::after,.que .que-item:first-of-type .more-btn em::after{border-color: #fff;}
.que-item:first-of-type:hover:after, .que-item:first-of-type:hover:before{border-color: #000;}