* { margin: 0; padding: 0; }
.banner { margin-top: 119px; width: 100%; }
.banner img { width: 100%; }
.content, .content_one .content_banner { margin: 0 auto; }
.content { margin-top: 30px; background-color: white; }
.content_banner { height: 50px; background-color: #2a2a2a; border-radius: 10px; color: white; }
.content_banner_role { margin-left: 40px; float: left; width: 15px; height: 15px; margin-top: 18px; background-color: white; border-radius: 8px; }
.content_banner span { height: 50px; line-height: 50px; margin-left: 20px; font-size: 16px; }
.content_banner span:hover { cursor: pointer; }
.content-books { float: left; margin-top: 30px; }
.content-books .img1 { float: left; }
.content-books .img1:hover { margin-top: 10px; opacity: 0.7; }
.content_one, .content_two { min-height: 520px; }
.content_three,.content_four { height: 100%; overflow:hidden;}
.content_three .p { margin: 0 auto; width: 1160px; padding:20px; }
.content_three p { text-indent: 2em; font-size: 16px; line-height: 25px; }
.content_four .p { margin: 0 auto;  width: 1160px; padding:20px; }
.content_four p { text-indent: 2em; font-size: 16px; line-height: 25px; }
.button { margin: 20px auto; width: 1200px; }