.pic_all {
    display: flex;
    justify-content: start;
    align-items: center;
    width: 100%;
    flex-wrap: wrap;
    box-sizing: border-box;
}

.pic_all .pic_list:nth-child(3n+3) {
    margin-right: 0;
}

.pic_list {
    width: 290px;
    margin-right: 16px;
    margin-bottom: 20px;
}

.pic_list img {
    width: 100%;
    height: 190px;
}

.pic_list video {
    width: 100%!important;
    height: 240px;
}