首页/styles.css

.base_block {
    max-width: 1600px;
    padding: 1.6em;
    margin: 0.8em auto;
    background-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 2px 5px #aaa;
}
.base_block .video_block {
	position: absolute;
	top: 0;
	left: 0;
	max-width: 1080px;
    padding-top: 56.25%; /* 1080 / 1920 * 100 = 56.25% */
	/*background-color: lightblue; /* 用于视觉效果，显示div的位置 */
	overflow: hidden;
}