.focus {
    position: relative;
    margin: 40px auto;
    width: 100%;
    height: 540px;
    overflow: hidden;
} 

.focus img {
    width: 100%;
    height: 540px;
}

.focus ul {
    position: relative; 
    width: 900%;
}

.focus ul li {
    float: left;
}

.arrow-l, .arrow-r {
    display: none;
    position: absolute;
    top: 50%;
    transform: translatey(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(0, 0, 0, .3);
    text-align: center;
    line-height: 48px;
    color: #fff;
    font-family: 'icomoon';
    font-size: 20px;
    z-index: 2;
}

.arrow-l {
    left: 10px;
}
.arrow-r {
    right: 10px;
}

.circle {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translatex(-50%);
}

.circle li {
    float: left;
    width: 8px;
    height: 8px;
    border: 2px solid rgba(255,255,255, 0.5);
    margin: 0 3px;
    border-radius: 50%;
    cursor: pointer;
}

.current {
    background-color: #fff;
}