header{margin: 0; margin-top: 1.6em;  margin-left: 16em; font-size: 18px; color: #666}
    ul,ol,p{margin: 0;padding: 0; list-style: none;}
    a {text-decoration: none; color: #666;}
    /*一级导航*/
    /*背景色*/
    ul.menu,ul.submenu {
        background-color: #fff;

    }
    /*一级导航浮动*/
    ul.menu::after {
        content: '';
        display: block;
        clear: both;
    }
    ul.menu > li {
        float: left;
        width: 120px;
        line-height: 3em;
        height: 3.5em;
        text-align: center;
        cursor:pointer;
        margin-left: 1em;
        margin-top: 1em;
    }
 
    /*二级导航项分割线*/
    ul.submenu {
        /*默认隐藏*/
        display: none;
    }
    ul.submenu > li {
        border-bottom: 1px solid #fff;
               font-size: 15px;
    }
    body{
    overflow-x: hidden;
}
      /*内容区*/
    .content {
        min-height: 800px;
        background-color: #fff;
    }
    /*选中特效*/
    ul.menu > li:hover {
   
   }
   ul.menu > li:hover > a {
     color: #f16622;
  }
   ul.menu > li:hover > ul.submenu {
      display: block;
   }
   /*动画帧*/
   @keyframes fade {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
  }
/*基础动画样式*/
   .animated {
    animation-duration: 1s;
    animation-fill-mode: both;
  }
   .fadeIn {
    animation-name: fade;
    animation-direction: normal;
  }
  
/*底部*/
.bottomDiv
{
	margin-top: 123px; 
	width:100%;
	min-width: 1250px; 
	height: 290px;
    background-color: #222222;
}
.bottomDiv .frist
{
  /* height: 20px; */
  height: 100%;
  width: 1350px;
  margin: 0 auto;
	/* margin-left: 10%; */
}
.bottomDiv .frist .li
{
	float: left;
	color: #fff;
	margin-top: 54px;
	margin-right: 5em;
	font-family: "微软雅黑";
}
.bottomDiv .frist .litwo
{
	float: left;
	font-size: 13px;
	color: #a9a9a9;
	margin-top: 60px;
	margin-right: 5em;
	font-family: "微软雅黑";
}
.bottomDiv .sed
{
	height: 20px;
	margin-left: 10em;
}
 .father .child{
   display:none;   //p的内容一开始设置为不可见
}
.father:hover .child{
     display:block;    //鼠标移入后，p的标签的内容为可见
}