/* Remove the navbar's default margin-bottom and rounded borders
.navbar {
  margin-bottom: 0;
  border-radius: 0;
}
*/
/* Set height of the grid so .sidenav can be 100% (adjust as needed)
.row.content {height: 450px}

/* Set gray background color and 100% height
.sidenav {
  padding-top: 20px;
  background-color: #f1f1f1;
  height: 100%;
}

/* Set black background color, white text and some padding
footer {
  background-color: #555;
  color: white;
  padding: 15px;
}

/* On small screens, set height to 'auto' for sidenav and grid
@media screen and (max-width: 767px) {
  .sidenav {
    height: auto;
    padding: 15px;
  }
  .row.content {height:auto;}
}
*/

img.pequeña{
  width: 50px; height: 50px;
}
img.mediana{
  width: 100px; height: 100px;
}
img.grande{
  width: 200px; height: 200px;
}