@charset "utf-8";
/* CSS Document */
.box{width: 680px; margin: 40px auto; display: flex; flex-wrap: wrap;}

.season-box {width: 330px; 
	height: 214px; 
	border-radius: 5px; 
	display: block;
	margin: 5px; 
	background-size: 100%;
	background-repeat: no-repeat;
	opacity: .5;
	transition: opacity 2s;}

.season-box:hover {opacity:1.0;}

.winter {background-image: 
url("images/winter.jpg");}

.spring {background-image: 
url("images/spring.jpg");}

.summer {background-image: 
url("images/summer.jpg");}

.fall {background-image: 
url("images/fall.jpg");}