.rows-qa {width:100%;float:left;position:relative;font-size:1.5em;margin-bottom:5px;}
.q {width:100%;float:left;min-height:50px;padding:18px 50px 15px 50px;box-sizing:border-box;background:#f2f2f2 url(../img/qa/q.png) top left no-repeat;}

.a {width:100%;float:left;background: url(../img/qa/a.png) center left no-repeat;min-height:34px;}
.a p {width:100%; padding:20px 20px 20px 60px;box-sizing:border-box;}
.btn {width:30px;height:30px;float:right;position:absolute;top:10px;right:10px;cursor:pointer;}
.cont4-left {width:40%;float:left;}
.cont4-right {width:60%;float:left;}
.cont4-right1 {width:50%;float:left;}
.cont4-right2 {width:50%;float:left;}
.cont4-left img , .cont4-right img {width:100%;padding:1px;box-sizing:border-box;}
.txt {width:100%;padding:2%;box-sizing:border-box;line-height:160%;font-size:1.7em;}

@media screen and (max-width: 640px) {
.txt {width:100%;padding:2%;box-sizing:border-box;line-height:160%;font-size:1.0em;}
}