body:before {
    background: url(https://img2022.cnblogs.com/blog/2773285/202203/2773285-20220319212846238-1305339803.jpg) center/cover no-repeat;
    content: '';
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.08;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    -webkit-filter: grayscale(40%);
    -moz-filter: grayscale(40%);
    -ms-filter: grayscale(40%);
    -o-filter: grayscale(40%);
    filter: grayscale(40%);
    filter: gray;
}

body{
    background-image: url("https://img2022.cnblogs.com/blog/2773285/202203/2773285-20220320121626512-1339422086.gif");
    background-position: initial;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-origin: initial;
    background-clip: initial;
    height:100%;
    width:100%;
    }


html/* 必应每日随机背景图*/
{
background:url(https://area.sinaapp.com/bingImg/) top center no-repeat #000;
background-attachment:fixed;
}
body
{
 background: none;
}
#mainContent
{
    background: #fff0; /* 导航菜单半透明*/
}
#cnblogs_post_body
{
    color: black;      
    font: 0.875em/1.5em "微软雅黑" , "PTSans" , "Arial" ,sans-serif;
    font-size: 15px;
}
#cnblogs_post_body h1    {
    text-align:center;
    background: #333366;
    border-radius: 6px 6px 6px 6px;
    box-shadow: 0 0 0 1px #5F5A4B, 1px 1px 6px 1px rgba(10, 10, 0, 0.5);
    color: #FFFFFF;
    font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
    font-size: 23px;
    font-weight: bold;
    height: 25px;
    line-height: 25px;
    margin: 18px 0 !important;
    padding: 8px 0 5px 5px;
    text-shadow: 2px 2px 3px #222222;
}
#cnblogs_post_body h2    {
    text-align:center;
    background: #006699;
    border-radius: 6px 6px 6px 6px;
    box-shadow: 0 0 0 1px #5F5A4B, 1px 1px 6px 1px rgba(10, 10, 0, 0.5);
    color: #FFFFFF;
    font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
    font-size: 20px;
    font-weight: bold;
    height: 25px;
    line-height: 25px;
    margin: 18px 0 !important;
    padding: 8px 0 5px 5px;
    text-shadow: 2px 2px 3px #222222;
}


<!-- 返回顶部 -->
<style>
#back-top {
     position: fixed;
     bottom: 10px;
     right: 8px;
     z-index: 99;
}
#back-top span {
     width: 70px;
     height: 140px;
     display: block;
     background:url(https://images.cnblogs.com/cnblogs_com/laoguantongxiegogo/1667745/o_200312023941%E8%BF%94%E5%9B%9E%E9%A1%B6%E9%83%A8.png) no-repeat center center;
}
#back-top a{outline:none}
</style>
<script type="text/javascript">
$(function() {
    // hide #back-top first
    $("#back-top").hide();
    // fade in #back-top
    $(window).scroll(function() {
        if ($(this).scrollTop() > 400) {
            $('#back-top').fadeIn();
        } else {
            $('#back-top').fadeOut();
        }
    });
    // scroll body to 0px on click
    $('#back-top a').click(function() {
        $('body,html').animate({
            scrollTop: 0
        }, 500);
        return false;
    });
});
</script>
<p id="back-top" style="display:none"><a href="#top"><span></span></a></p>


#Snow{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    background: rgba(125,137,95,0.1);
    pointer-events: none;
}