@charset "utf-8";
*{
	margin: 0;
	padding: 0;
	list-style: none;
	border: none;
}
.banner{
	width:1100px;
	height: 500px;
	margin: 100px auto;
}
body{
	overflow: hidden;
}



.bomb-box {
	width: 100%;
	height: 100%;
	border: 40px solid #ddd;
	position: relative;
}

.bomb-box a {
	display: block;
	width: 100%;
	height: 100%;
	position: relative;
}

.bomb-box button {
	outline: none;
	width: 20px;
	height: 60px;
	background: rgba(0, 0, 0, 0.3);
	position: absolute;
	top: 50%;
	margin-top: -30px;
	cursor: pointer;
	color: white;
}

.bomb-box button:nth-of-type(1) {
	left: -20px;
}

.bomb-box button:nth-of-type(2) {
	right: -20px;
}

.bomb-box span {
	float: left;
}