#uml img{
    max-width: 100%;
  }

  #interfaces img{
    max-width: 100%;
  }
  
  #header img {
    width: 140px;
  }  
  
  
  #requerimientos {
    background-color: #343a40;
    color: white;
  }
  
  #footer {
    background: linear-gradient(90deg,#1c3643,#273b47 25%,#1e5372);
  }
  
  #footer a {
    color: white;
  }