@media all and (min-width: 768px) {
#qa-main{width:980px; background:#FFFFFF;margin:0px auto;padding:5px;}
.imgC span {width:960px;height:539px;margin:8px auto;display:block;text-indent: -9999px;  }
}
@media all and (max-width: 767px) {
#qa-main{ background:#FFFFFF;margin:5px auto;padding:5px;}
.imgC span{width:100%; height:0; padding:56.145833333333% 0 0;display:block;background-size: contain;position:relative;text-indent:-9999px;margin-bottom:5px;}
}
.banner{margin:5px auto;width:350px;}
.btn {
margin:5px auto;
    padding: 15px 70px;
    font-weight: bold;
    display: inline-block;
    text-decoration: none !important;
    font-size: 20px;
    border-radius: 5px;
}
.oubo {
    background-color: #3169d1;
    border: 2px solid #3169d1;
    color: #fff !important;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-transition: all .3s;
    transition: all .3s;
}
.oubo:hover {
    background-color: transparent;
    border: 2px solid #458bfa;
    color: #458bfa !important;
    border-radius: 30px;
}