.banner
{
    width: 100%;
    height: 380px;
    overflow: hidden;
    position: relative;
    margin: auto;
    
}
.banner img
{
    width: 100%;
    height: 360px;
    position: absolute;
    top: 0;
    left: 0;
    visibility: hidden;
}
.btn-pre, .btn-next
{
    position: absolute;
    top: 50%;
    margin-top: -25px;
    width: 40px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background: rgba(0,0,0,0.4);
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    z-index: 10;
    border: none;
}
.btn-pre
{
    left: 10px;
}
.btn-next
{
    right: 10px;
}
.dots
{
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
}
.dots span
{
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ccc;
    margin: 0 4px;
    cursor: pointer;
}
.dots span.active
{
    background: red;
}

.txt-desc
{
     position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background: rgba(0,0,0,0.4);
    color: #fff;
    
}