ul,
ol {
    list-style: none;
}

.slider {
    width: 1100px;
    height: 450px;
    background-color: purple;
    margin: 60px auto 30px;
    position: relative;
    overflow: hidden;
}

.slider>ul {
    position: absolute;
    top: 0;
    left: 0;
    width: 600%;
}

.slider>ul>li {
    float: left;
}

.slider>ul>li img {
    width: 1100px;
    height: 450px;
}

.arrow-left,
.arrow-right {
    width: 24px;
    height: 40px;
    background-color: rgba(0, 0, 0, 0.3);
    position: absolute;
    top: 50%;
    margin-top: -20px;
    z-index: 2;
    text-align: center;
    line-height: 40px;
    color: white!important;
    font-size: 20px;
    display: none;
}

.arrow-left {
    left: 0;
}

.arrow-right {
    right: 0;
}

ol.circle {
    position: absolute;
    bottom: 10px;
    left: 50px;
}

.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;
}