.pos-a {
	position: absolute;
}
.pos-f {
	position: fixed;
	z-index: 1;
}
.pos-right {right: 0}
.pos-tl-c {
	top: 50%;
	left: 50%;
	-webkit-transform: translate(-50%, -50%);
	        transform: translate(-50%, -50%);
}
.pos-bottom {
	bottom: 0
}
.pos-full {
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
}
.border-radius-c {
	border-radius: 50%;
}
.use-close {
	right: 30rpx;
	bottom: 88rpx;
	width: 68rpx;
	height: 68rpx;
	background: rgba(0, 0, 0, .58);
}