#main {
     margin-top: 35px;
}

/* 定制自己导航栏的样式 */
#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 { 
    background-color:rgb(33, 157, 219);
}
#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: 160px;
    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: #18dfdf;
}
#shwtop .dropdown:hover .dropdown-content{
    display: block;
}

/* 定制生成博客目录的CSS样式 */
#uprightsideBar{
    font-size:16px;
    font-family:Arial, Helvetica, sans-serif;
    text-align:left;
    position:fixed;
    /*
    将div的位置固定到距离top:150px，right:0px的位置，
    这样div就会处在最右边的位置，距离顶部150px，
    当然这两个值你可以自己改。
    */
    top:auto;
    right:auto;
    width: auto;
    height: auto; 
}
#sideBarTab{
    float:left;
    width:25px; 
    box-shadow: 0 0 8px #877788;
    border:1px solid #00DDC00;
    border-right:none;
    text-align:center;
    background:rgb(0, 220, 0);
}
#sideBarContents{
    float:left;
    overflow:auto; 
    overflow-x:hidden;!important;
    width:200px;
    min-height:101px;
    max-height:460px;
    border:1px solid #e5e5e5;
    border-right:none; 
    background:#ffffff;
}
#sideBarContents dl{
    margin:0;
    padding:0;
}
#sideBarContents dt{
    margin-top:5px;
    margin-left:5px;
}
#sideBarContents dd, dt {
    cursor: pointer;
}
#sideBarContents dd:hover, dt:hover {
    color:#A7995A;
}
#sideBarContents dd{
    margin-left:20px;
}

/* 定制推荐和反对按键 */
#div_digg{
  position:fixed;
  bottom:-10px;
  width:120px;
  right:20px;
  box-shadow: 0 0 6px #0000FF;
  border:2px solid #FF0000;
  padding:4px;
  background-color:#fff;
  border-radius:4px 4px 4px 4px !important;
}

.icon_favorite {
    background: transparent url('https://images.cnblogs.com/cnblogs_com/shwee/1218109/o_kj.gif') no-repeat 0 0;
    padding-left: 15px;
}

#blog_post_info_block a {
    text-decoration: none;
    color: #5B9DCA;
    padding: 3px;
}

/* 定制返回顶部按键 */
#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;
}


/* 定制公告栏文字信息 */
.gonggao{
    text-align: center;
    font-size:17px;
    color:blue;
}
.wenzi{
    text-align: center;
    font-size:15px;
}

/* 定制公告栏时钟位置 */
#clockdiv {
    /* left, center, right */
    text-align: center;
}

/* 定制博客背景图片，url里面是你的图片位置信息 */
body { 
     background-color: #efefef;
     background-image:url(https://images.cnblogs.com/cnblogs_com/blogs/809162/galleries/2365548/o_231210120439_W%5B%25HO9I2W2UHQ2CCL___%25%5D0.png); 
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
    padding-top:0px;
  }



body {

    background-image: url(https://images.cnblogs.com/cnblogs_com/blogs/809162/galleries/2365548/o_231210120439_W%5B%25HO9I2W2UHQ2CCL___%25%5D0.png);

    background-width: 100%;

    background-height: 100%;

    background-size: cover;

    background-attachment: fixed;

    background-position: center 0;
}

.postTitle {

    font-size: x-large !important;

}


#home, pre {

    background-color: #fffc !important;

    border-radius: 10px;

}


code {

    background-color:  #fffc !important;

}


#sideBar div {

    background-color: transparent !important;

}


.table-wrapper {

    background-color: #fff9;

}

.table-wrapper th {

    background-color: #fff9 !important;

}


blockquote, details {

    background: none !important;

    background-color: #eee8 !important;

    border-radius: 10px;

}

summary {

    border-radius: 10px;

    background-color: #eee9;

    font-size: large;

    font-weight: bold;

}


 <style>
        body{
            height: 1500px;

        }
        #test{
            position: fixed;
            right: 57px;
            bottom: 50px;
            width: 42px;
            height: 42px;
            background: url(//0.ss.faisys.com/image/backToTop/firstStyle/04.png?v=201505251717);
            margin:0;
            padding: 0;
            border: 0;
        }
        #test:hover{
            background: url(//0.ss.faisys.com/image/backToTop/firstStyle/04_hover.png?v=201505251717);
        }
    </style>