#fondo{
  background: #e8e8e8;
  position: absolute;
  width: 100%;
  height: 100%;
}

#imagen_fondo{
  position: absolute;
  bottom: 0px;
  margin-right: auto;
  width: 100%;
  margin-left: auto;
  opacity: 0.7;
}

body {
    background-image: url('../media/driving-car.jpg');
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position:center center;
    background-size: cover;
    padding: 0;
    opacity: 0.7;
}

.header{
  max-height: 20rem;
}

.logo{
  height:10rem !important;
  margin: 1rem 0 0 4rem;
}

.contenedor{
  width:100%;
  height:100%;
  /*position: absolute;*/
}