body {

    display: block;
    margin: 8px;
    margin-top: 8px;
    margin-right: 70px;
    margin-bottom: 8px;
    margin-left: 70px;
}



* {
  box-sizing: border-box;
}
.menu {
  float: left;
  width: 20%;
}
.menuitem {
font-size:12px;
  padding: 5px;
  margin-top: 3px;
  border-bottom: 1px solid #f1f1f1;
}
.main {
  float: left;
  width: 60%;
  padding: 0 20px;
  overflow: hidden;
  
  
      margin-left: 20px;
    font-size: 12px;
    padding: 0px 10px;
    min-width: 250px;
    max-width: 600px;
    max-height: 900px;
    min-height: 200px;
  
  
  
  
  
  
}
.right {
  background-color: #;
  float: left;
  width: 20%;
  padding: 10px 15px;
  margin-top: 67px;
}

@media only screen and (max-width:800px) {
  /* For tablets: */
  .main {
    width: 80%;
    padding: 0;
  }
  .right {
    width: 100%;
  }
}
@media only screen and (max-width:500px) {
  /* For mobile phones: */
  .menu, .main, .right {
    width: 100%;
  }
}

 
.responsive {
  width: 100%;
  height: auto;
}