.step {
		height: 460px;
		width: 530px;
		background-color: #1b1b1b;
	}
	
	.titileItme {
		color: #ffffff;
		font-size: 22px;
		line-height: 10px;
		margin-bottom: 18px;
	}
	
	.mydiv{ 
		position:absolute;
		left:50%;
		top:50%;
		margin:-310px 0 0 0px;
 	} 
	
	button {
		display: inline-block;
		padding: 6px 12px;
		margin-bottom: 0;
		line-height: 1.4;
		text-align: center;
		cursor: pointer;
		border-radius: 4px;
		border: 1px solid transparent;
		color: #fff;
		background: #1aba9c;
	}
	
	#modal-overlay {
		display: none;
		position: fixed;
		/* 使用绝对定位或固定定位  */
		left: 0px;
		top: 0px;
		width: 100%;
		height: 100%;
		text-align: center;
		z-index: 1000;
		background-color: #333;
		opacity: 0.97;
		/* 背景半透明 */
	}
	/* 模态框样式 */
	
	.modal-data {
		width: 70%;
		height: 90%;
		margin: 35px auto;
		background-color: #000;
		border: 1px solid #000;
		padding: 15px;
		text-align: center;
		border-radius: 4px;
		overflow-y: scroll;
	}
	
	#x {
		position: relative;
		top: 0px;
		right: 0px;
	}