style.head-bg {				position: absolute;				height: 1.9rem;				width: 100%;  				overflow: hidden;				z-index: -1;							} .head-bg .bgImg{ 				position: absolute;  				content: '';				z-index: 1;				height: 2.5rem;				top: -.6rem;				left: -75%;				width: 250%;				border-radius: 50%; 				overflow: hidden;			}.head-bg .bgImg:after{				position: absolute;  				content: '';filter:blur(10px);   //模糊				z-index: 1;				height: 3.9rem;				top: -1rem;				left: 0;				width: 100%;				background: url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1536115840&di=9fbd7bb1fd052bceb0b3c47833e4c084&imgtype=jpg&er=1&src=http%3A%2F%2Ffile25.mafengwo.net%2FM00%2F0A%2FAC%2FwKgB4lMC26CAWsKoAALb5778DWg60.rbook_comment.w1024.jpeg) no-repeat center;				background-size:200%;			}html