body{background:#fff;}
.flex{display:flex;flex-direction:row;flex-wrap:wrap;justify-content:space-between}

.online{z-index:99999;}
.yindao{width:100%;margin:0 auto;text-align:center;box-sizing:border-box;}
.yindao a{display:block;width:49.5%;color:#fff;font-size:1.2em;
  text-decoration:none;
  box-sizing:border-box;
  margin:1em 0;padding:0.5em 0;}
.yindao a:nth-child(1){float:left;background:#90ddcc;}
.yindao a:nth-child(2){float:right;background:#ffa800;}
.zy div.zy_title img.lazy{width:2em;}
.photo div.photo_title img.lazy{width:2em;}
.photo div.photo_title img.lazy{width:2em;}
.news div.news_title img.lazy{width:2em;}
div.teacher_title img.lazy{width:2em;}
div.student_title img.lazy{width:2em;}