.portTit{
    background-image: url(./portBK.jpg);
    background-size:100% 100%;
    background-repeat:no-repeat;
    width:100%;
    color: white;
    font-size: 0.28rem;
    padding-top: 0.08rem;
    padding-bottom: 0.08rem;
    text-align: center;
box-shadow: 0px 7px 5px #888888;
    margin-bottom: 7px;
}