section {
	border: solid 1px #ccc;
	margin: 20px;
	padding: 20px 20px 25px 20px;
	}

 /*navi*/
h3 {
	margin: 0;
	font-size: 18px;
	color: #37d;
	}
.main-nav,.main-nav2,.main-nav3,.main-nav4 {
	width: 539px;
	margin: 10px auto 0 auto;
	border: 1px solid #e55;
	padding: 0;
	}	
.main-nav2,.main-nav3 {
	width: 646px;
	}
.main-nav4 {
	min-width:600px;
	}
.main-nav li,.main-nav2 li,.main-nav3 li,.main-nav4 li {
  list-style-type: none;
	margin-left: 4px;
	}
.main-nav a,.main-nav2 a,.main-nav3 a,.main-nav4 a {
	box-sizing: border-box;
	width: 93px;
	margin: 5px;
	border-radius: 3px;
	background: #26a;
	font-size:15px;
	color: #fff;
	display: block;
	padding: 6px 0 4px 0;
	text-align: center;
	text-decoration: none;
	}
	.main-nav3 a {
	width: 114px;
	}
	.main-nav4 a {
	min-width: 70px;
	padding: 6px 10px 4px 10px;
	width: auto;
	}
.main-nav a:hover,.main-nav2 a:hover,.main-nav3 a:hover,.main-nav4 a:hover {
	background: #6af;
	color: #15b;
	}
.flex {
	display : -webkit-box;
	display : -ms-flexbox;
	display : -webkit-flex;
  display: flex;
	}