.line{
	width: 36px;
	border-bottom: 3px solid rgb(50, 55, 60);
	float: auto;
	margin: auto;
	margin-top: 36px;
}

img{
	width: 470px;
	margin: 60px 0 50px 0;
}

.left{
	float: left;
	width: 470px;
	margin-right: 40px;
}

.right{
	float: right;
	width: 470px;
	margin: 0;
}

.hover {position:relative;}

.hover img {
  position: absolute;
  /* CSS3淡出淡入效果,1秒 */
  -webkit-transition: opacity 0.5s ease-in-out;
  -moz-transition: opacity 0.5s ease-in-out;
  -o-transition: opacity 0.5s ease-in-out;
  transition: opacity 0.5s ease-in-out;
}

.hover img:nth-of-type(2):hover{
  opacity: 0; /*滑鼠滑入時，透明度變0*/
}