*,body,html{margin:0;padding:0;letter-spacing:.04em}div{font-size:14px}a{text-decoration:none}.content{width:100%}.content_main{width:70%;margin:0 auto}.congent_big_bg{background-color:#f6f6f6;width:100%}@media (max-width:1200px){.content_main{width:90%;margin:0 auto}}