.video-list{width:100%; margin:2% 0;}
.video-list li{ float:left; width:31%;background:#f5f5f5;margin: 1% 1% 1% 1%;}
.video-list li .thumb{ 
    display: block;
    position: relative;
    top: 0;
    left: 0;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
}
.video-list li .thumb img{ 
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 1s;
}

.video-list li .item{ padding:5%;}

.video-list li .item h3{font-size:15px; color:#55504f;text-overflow: ellipsis;white-space: nowrap;overflow: hidden;}

.video-list li:hover .item{
    background: #e50012;
}
.video-list li:hover .item h3 {
    color:#fff;
}

/*鼠标hover效果*/
.video-list li:hover .thumb img {
	-webkit-transform: scale(1.1);
	transform: scale(1.1);
}
.video-list li .thumb:after {
    display:none;
    content: "";
    position: absolute;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: 1;
    transition: all 0.3s;
    background:rgba(0, 0, 0, 0.2) url(../images/video.svg) no-repeat center -500px/40px;
}
.video-list li:hover .thumb:after {
    display:block;
    background:rgba(0, 0, 0, 0.3) url(../images/video.svg) no-repeat center center/40px;
}


@media screen and (max-width:1024px){
.video-list li{
    width:97%;
    margin:2% 1.5%;

}
.video-list li .thumb i img{
    width:15%;
}
.video-list li .thumb:after {
    display:block;
    background:rgba(0, 0, 0, 0.3) url(../images/video.svg) no-repeat center center/30px;
}
}