ul, ol {
    list-style: none;
    padding: 0;
    margin: 0;
}

img {
    display: block;
}

.play-box {
    position: relative;
    margin: 100px auto;
    width: 600px;
    height: 600px;
    overflow: hidden;
}

.images {
    position: absolute;
    left: 0;
    top: 0;
    display: flex;
}

.images li {
    flex: 0 0 auto;
    width: 600px;
    height: 600px;
}

.btns {
    position: absolute;
    right: 10px;
    bottom: 10px;
    display: flex;
}

.btns li {
    margin-left: 10px;
    width: 20px;
    height: 20px;
    text-align: center;
    line-height: 20px;
    color: #fff;
    background: #000;
    border: 1px solid #fff;
    border-radius: 50%;
    cursor: pointer;
}

.btns li.active {
    color: #f60;
    border-color: #f60;
}

.arrow {
    position: absolute;
    top: 50%;
/*     width: 40px;
    height: 100px; */
    transform: translateY(-50%);
    background-image: url(../imgs/index.png);
    cursor: pointer;
}

.arrow-prev {
	width: 40px;
    height: 100px;
    left: 0;
}

.arrow-next {
	width: 40px;
    height: 100px;
    right: 0;
    background-position-x: -50px;
}