.sub_title{display: block;float: left;width: 70%;padding: 3% 0; background-color: #333; color: #fff; text-align: center; font-size: 1.2em;font-weight: bold;}
.next{display: block;float: right; width:15%; padding:3% 0; background-color: #333;background-image: url(../image/mobile_sub_next.png);background-size: contain;text-indent: -9999px;background-repeat: no-repeat;font-size: 1.2em;}
.back{display: block;float: left; width:15%; padding:3% 0; background-color: #333;background-image: url(../image/mobile_sub_back.png);background-size: contain;text-indent: -9999px;background-repeat: no-repeat;font-size: 1.2em;}
img{width: 100%}
.end{display: block;float: right; width:15%; padding:3% 0; background-color: #333;text-indent: -9999px;font-size: 1.2em;}