2{
    font-size: 15px;
    padding: 0;
    
    font-family: "微软雅黑","宋体",Arial;
    width: 100%;
    height: 100%;
    background: #FFFF url(https://files.cnblogs.com/files/blogs/693135/lhyun.ico) no-repeat top center fixed;
    background-size: cover;
  }
#mainContent{
  background-color:rgba(245,245,245,0.6);
}
#navigjdjdator{
  bakground-color:rgba(79,148,205,0.8);