* {
    padding: 0;
    margin: 0;
}

body{
    min-width: 100%;
    min-height: 100%;
    font-family: sans-serif;
}
#container{
    display: flex;
    flex-direction: column;
    /*height: 100%;*/
    justify-content:space-between;

}
#header {
    position: relative;
    /*flex: 1 0 auto;*/
    width: 100%;
    height: 75px;
}
#header_top{
    position: fixed;
    width: 100%;
    background-color: white;
    z-index: 100;
}

#header_top ul{
    position: relative;
    /*float: bottom;*/
    margin:10px 0px 10px 50px ;
    text-align: center;
}
#header_top ul li{
    font-size: 20px;
    color: black;
    display:inline-block; /*设置元素是否被视为块或者内联元素*/
    padding:10px 20px ; /*元素内填充*/
    height:30px;
    margin:0px 0px 0px -4px ; /*设置所有外边距属性*/
    /*line-height:34px;*/
    cursor:pointer; /*鼠标指针放在一个元素边界范围内时所用的光标形状*/
}

#header_top ul li:hover{
    color: #2387c7;
}
.icon{
    position: relative; /*相对定位*/
    left: -110px;
    top: 10px;

}
.header_div{
    position: relative;
    display:none;
    width: 100%;

}
.header_div:nth-child(1){
    display:block;
}
#head_div{
    text-align: center;
}


.active{
    border-bottom: #2387c7 2px solid;
}
/*导航栏样式结束*/
.content{
    width: 1000px;
    height: 900px;
    text-align: center;
    font-size: 28px;
    position: absolute;
    left: 0;
    right: 0;
    top: 350px;
    bottom: 0;
    margin: auto;
}
.img_content{
    padding-top: 30px;
    width: 600px;
    height: 8500px;
}
.annex{
    width: 1000px;
    height: 20px;
    text-align: center;
    /*background-color: red;*/
    position: absolute;
    left: 0;
    right: 0;
    top: 8800px;
    bottom: 0;
    margin: auto;
}
.date{
    font-size: 12px;
}