nav>ul>li:nth-child(4)>a{color: #0287d2;font-weight: 600}

.screen{margin:50px auto 20px;}
.screen>div:last-child{padding-bottom: 0}

.expert-list{min-height: 500px;}
.expert{margin:15px;width: 270px;height: 390px;background-color: #fff;transition: all ease .5s;box-shadow: 0 0px 5px -2px rgba(0,0,0,.3);}
.expert-img{margin:20px auto;width: 200px;height: 200px;border: 1px solid #0287d2;border-radius: 100%;overflow: hidden}
.expert-img a{display: block;width: 100%;height: 100%;}
.expert-img a>img{width: 100%;height: 100%;}
.expert-info>div{float: left;margin:20px;}
.expert-title>p{margin: 5px 0;}
.expert-title{color: #0287d2;width: 130px;font-size: 15px;}
.expert-title span{color: #000;}
.expert-title strong{color: red}
.expert-info>div>button{width: 60px;height: 60px;margin-top: 20px;border-radius: 100%;background-color: #0287d2;color: #fff;outline: none;transition: all ease .5s;}

.expert:hover{box-shadow:2px 2px 10px rgba(0,0,0,.5)}
/*.expert-info>div>button:hover{width: 60px;height: 60px}*/

/*购买*/
.wechat{width: 400px;margin: 0 auto;text-align: center}
.wechat>h3{margin: 60px;}

.input-group.second-screen{background-color: #fff;}