* {
    margin:0;
    padding:0;
  }
  
  #barrasuperior{
    position:fixed;
    left:0px;
    width:100%;
    height:50px;
    background-color:black;
    color:white;
  }
  
  #barralateral{
    position:fixed;
    left:0px;
    top:50px;
    width:200px;
    height:100%;
    background-color:#eee;
  }
  
  #contenido{
    padding-top:70px;
    padding-left:220px;
  }