.img_slide
{
	width: 100%;
	height: 450px;
	vertical-align: middle;
}
.slide
{
	float: left;
	width: 100%;
	height: 450px;
	position: relative;
	padding: 0;
}
.slide_nav
{
	position: absolute;
	left: 0;
	top: 50%;
	width: 100%;
}
.slide_nav_item
{
	position: absolute;
	padding: 0 23px 5px 23px;
	font-size: 40px;
	font-weight: bold;
	margin-top: -30px;
	z-index: 99;
	color: #fff;
}
.slide_nav_item:hover
{
	cursor: pointer;
}
.slide_nav_item.b
{
	background: rgba(0,0,0,0.7);
	left: 20px;
	border-radius: 50%;
}
.slide_nav_item.g
{
	background: rgba(0,0,0,0.7);
	right: 20px;
	border-radius: 50%;
}
.slide_item
{
	display: none;
}
.slide_item.first
{
	display: block;
}