* {
     box-sizing:border-box;
   }
   body {
     background-color:#dee;
   }
   div.box {
     background-color:white;
     max-width: 1000px;
     margin:15px auto 15px;
     padding:15px 15px 15px;
     border-radius:20px;
     border:2px solid gray;
     box-shadow:8px 15px 25px #999;
     font:1.2em/1.62 sans-serif;
   }
   a {
     text-decoration:none;
   }
  @media screen and (max-width:620px) {
    .left, .main, .right {
      width:100%;
    }
    div.box {
      padding-bottom:200px;
    }
  }