<>* {margin: 0px;padding: 0px;}.wrap {width: 100%;}.box {width: 100%;height: 0px;/* 16:9padding-bottom:52.25%，4:3padding-bottom:75% */padding-bottom: 52.25%;position: relative;background: black;}.box p {width: 100%;height: 100%;position: absolute;color: #000000;}