/*------------- 从左侧显示遮罩效果 开始 ------------------------------*/
.content-four{
	height: 500px;
	padding:30px 0 0 90px;
}
.con-four{
	width: 297px;
	height: 198px;
	float: left;
	margin-right: 35px;
	margin-bottom: 35px;
	position: relative;
	overflow: hidden;
	cursor: pointer;
}
.con-four img{
	width:297px;
	height: 198px;
}
.txt-four{
	font-size: 20px;
	position: absolute;
	left: -297px;
	top: 0;
	width: 100%;
	height: 138px;
	padding-top: 60px;
	line-height: 45px;
	text-align: center;
	color: #fff;
	background: rgba(0,0,0,0.6);
	/*display: none;*/
}