* {box-sizing: border-box;}
	body {margin: 0;}

	/* 公司名称大标题 */		
	.header {background-color: #f1f1f1; padding: 20px; text-align: center; border-bottom: 3px solid #404040; }
	.header h1{ letter-spacing: 0.25em; font-size: 64px; padding: 0; margin: 0; color: #f24f00; text-shadow: 2px 2px 4px #303030; }
	
	/* 顶部导航栏 */
	.nav_bar	{display: block; }
	.nav_bar ul	{list-style-type:none; margin: 20px; text-align: center; }
	.nav_bar ul	li {display: inline-block; color: #404040; width: 150px; margin: 0 20px; text-align: center; padding: 10px; font-size: 1.44em; letter-spacing: 2px;  border-radius: 10px 10px 0 0;}
	.nav_bar ul	a {text-decoration: none; }
	.nav_bar ul	li:hover	{box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.3); }
	.nav_bar .active {border-bottom: 3px solid #FF7300;}

	.dropdown-content
	{
		display: none;
	    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.7);
		position: absolute;
		margin-top: 10px;
		text-align: left;
		padding-top: 20px;
		padding-bottom: 20px;
		background-color: white;
		z-index: 1;
	}
	
	.dropdown-content a 
	{
		display: block;
		color: #404040; 
		padding: 5px;
		padding-left: 40px;
		padding-right: 40px;
		border-bottom: 1px solid #e0e0e0;
	}		

	.dropdown-content a:hover
	{
		background-color: #FF7300;
	}
	
	.dropdown:hover .dropdown-content
	{
		display: block;
	}

	/* 页脚 */		
	footer
	{
		text-align: center;
		background-color: #505050;
		color: white;
		padding: 20px;
	}
	
	footer a
	{
		vertical-align: middle;
		color: white;
	}