.w3-theme {
     color: #fff !important;
     background-color: grey !important
 }
 
 .w3-btn {
     background-color: #4CAF50;
     margin-bottom: 4px
 }
 
 .w3-code {
     border-left: 4px solid #4CAF50
 }
 
 .myMenu {
     margin-bottom: 150px
 }
 
 .main {
     font-size: 18px;
     line-height: 150%;
     font-family: "微软雅黑","幼圆", Arial, Helvetica, sans-serif;
     text-align: left;
     max-width: 600px;
 }
 
 .active1 {
     color: #000;
     background-color: #fff;
 }
a{
     text-decoration: none;
}
a:hover{
     text-decoration: underline;
}