* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

li {
    list-style: none;
}

img {
    width: 1000px;
    height: 300px;
    border-radius: 25px;
    overflow: hidden;
}

.banner {
    position: relative;
    margin: 50px auto;
    width: 1000px;
    height: 300px;
    background-color: pink;
    border-radius: 25px;
    z-index: 1;
    overflow: hidden;
}

/* 向左向右按钮 */
.btn {
    position: absolute;
    top: calc(50% - 30px);
    display: block;
    height: 60px;
    width: 30px;
    line-height: 60px;
    text-align: center;
    transition: all .3s;
    z-index: 2;
    color: white;
}

.btn:hover {
    background-color: #ccc;
    color: white;
}

.btn-l {
    left: 0;
}

.btn-r {
    right: 0;
}

/* 圆形按钮 */

.banner ol {
    position: absolute;
    bottom: 10px;
    left: 30px;
}

.banner ol li {
    float: left;
    margin-left: 10px;
    height: 8px;
    width: 8px;
    border-radius: 50%;
    border: 2px solid rgb(255, 255, 255);
    transition: all .3s;
}

.banner ol .current {
    background-color: white;
}

/* 轮播图核心区域-图片 */

.banner ul {
    width: 500%;
    height: 100%;
    transition: all .3s;
}

.banner ul li{
    float: left;
}