#console{
  float: right;
  width: 200px;
  font-size: 15px;
}
#main{
  width: 500px;
  height: 1000px;
  background-color: blue;
  overflow: hidden;
}
#sub{
  margin: 5px 10px;
  padding: 3px  6px;
  border: 1px solid #eee;
  width: 50px;
  height: 50px;
  background-color: red;
}