.video ul {
    display: flex;
    flex-wrap: wrap;
    margin-top: 80px;
    margin-bottom: 220px;
    justify-content: space-around;
}

.video li {
    position: relative;
    width: 47.5%;
    max-width: 780px;
    margin-bottom: 35px;
}

.video li .putImg {
    position: relative;
    overflow: hidden;
    border-radius: 30px;
}

.video li .putImg img {
    transition: all .4s;
}

.video li .play {
    position: absolute;
    width: 99px;
    height: 99px;
    top: 50%;
    left: 50%;
    cursor: pointer;
    transform: translate(-50%, -50%);
}



@media (max-width: 768px) {
.video li { width:100%;}
.video li .play{ width:50px; height:50px;}
.video ul{ margin:15% 0 15%;}
}