#home {
    opacity: 0.7;
    margin: 0 auto;
    width: 70%;
    min-width: 950px;
    background-color: #fff;
    padding: 30px;
    margin-top: 30px;
    margin-bottom: 50px;
    box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}

body { 
     background-color: #e6e6e6;
     background-image: url(https://images.cnblogs.com/cnblogs_com/wyzwyz/1862880/o_211221061149_58485664_p0.jpg);
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
     opacity:0.75
}

#top_nav{display:none;left:0;top:61px}

div[id^="ad_"] {
    display: none;
}
div[class^="c_ad"] {
    display: none;
}
div[id^="under_post"] {
    display: none;
}