#kuang {
    position: relative;
    width: auto;
    height: auto;
    max-height: auto;
    margin-bottom: 15px;
    margin-top: 15px;
    text-align: center;
    opacity:0.9;
    border: 0;
    border-radius: 10px;
    color: rgba(0, 0, 0, .87);
    background: #fff 50%;
    background-size: cover;
    box-shadow: 0 15px 35px rgba(50, 50, 93, .1), 0 5px 15px rgba(0, 0, 0, .07);
    margin:0 auto;
}