.class-wrap{
		display: none;
		opacity: 0.8;
		position: fixed;
		left: 0;
		right: 0;
		top: 0;
		bottom: 0;
		padding: 16px;
		background-color: rgba(1, 1, 1, 0.725);
		z-index: 100;
		overflow: auto;
	}
.class-window{
		max-width:900px;
		max-height:900px;
		width: 99%;
		height: 95%;
		margin: 30px auto;
		display: none;
		background: white;
		z-index: 200;
		position: fixed;
		left: 0;
		right: 0;
		top: 0;
		bottom: 0;
	}
	.close{
		margin-left: 364px;
		margin-top: 4px;
		cursor: pointer;
	}