#header{display:none;} /* 将默认的导航头屏蔽掉，这样才能把自己的导航栏加上去 */

/* 定制自己导航栏的样式 */
*{
margin:0;
padding:0;
}
#toTop {
    background: url(//https://images.cnblogs.com/cnblogs_com/shwee/1218109/o_toTop.bmp) no-repeat 0px top;
    width: 57px;
    height: 57px;
    overflow: hidden;
    position: fixed;
    right: 180px;
    bottom: 20px;
    cursor: pointer;
}
#shwtop ul {
    margin: 0;
    padding: 0;
    list-style-type: none; /*去除li前的标注*/
    background-color: #333;
    overflow: hidden; /*隐藏溢出的部分，保持一行*/
}
#shwtop li {
    float: left; /*左浮动*/
}
#shwtop li a, .dropbtn {
    display: inline-block; /*设置成块*/
    color: white;
    text-align: center;
    text-decoration: none;
    padding: 14px 16px;
}
/*鼠标移上去，改变背景颜色*/
#shwtop li a:hover, .dropdown:hover .dropbtn { 
    /* 当然颜色你可以自己改成自己喜欢的，我还是挺喜欢蓝色的 */
    background-color: blue;
}
#shwtop .dropdown {
    /*
    display:inline-block将对象呈递为内联对象，
    但是对象的内容作为块对象呈递。
    旁边的内联对象会被呈递在同一行内，允许空格。
    */
    display: inline-block;
}
#shwtop .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 120%;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
#shwtop .dropdown-content a {
    display: block;
    color: black;
    padding: 8px 10px;
    text-decoration:none;
}
#shwtop .dropdown-content a:hover {
    background-color: #a1a1a1;
}
#shwtop .dropdown:hover .dropdown-content{
    display: block;
}
.gonggao{
    text-align: center;
    font-size:17px;
    color:blue;
}
.wenzi{
    text-align: center;
    font-size:15px;
}
#clockdiv {
    /* left, center, right */
    text-align: center;
}
body { 
     background-color: #efefef;
     background-image:url(https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2388148966,224024745&fm=26&gp=0.jpg); 
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center  20%; 
     background-size: cover; 
    padding-top:0px;
  }