.expert_con{
    padding-bottom: 40px;
}

.expert_con>ul>li{
    width: 23.5%;
    margin-right: 2%;
    border: 1px solid #e6e6e6;
    margin-bottom: 40px;
    transition: all 0.4s;
    float: left;
    cursor: pointer;
}
.expert_con>ul>li:hover .expert_text{
    background: #c90915;
    color: #fff;
}
.expert_con>ul>li:nth-child(4n){
    margin-right: 0;
}
.expert_tu{
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #f6f6f6;
    text-align: center;
    color: #383432;
}
.expert_tu img{
    width: 100%;
    height: 100%;
}
.expert_text{
    border-top: 1px solid #e6e6e6;
    padding: 18px 20px;
    background: #fff;
    transition: all 0.4s;
}
.expert_text h3{
    font-size: 22px;
}
.expert_text h4{
    font-size: 14px;
    margin-top: 4px;
}