.footer {
          position: fixed;
          text-align: center;  
          left: 0;
          bottom: 0;
          width: 100%;
          background-color: rgb(0, 0, 0);
          color: white;                 
}
h3, .centrado, #encabezado_bienvenidos{
    text-align: center;
}
p{
    text-align: justify;
}
img{
    display: block;
    margin: auto;   
    width: 100%;     
}
.izquierda{
text-align: left;
}
.btn-primary {
    color: #fff;
    background-color: #f29100;
    border-color: transparent;
}
.btn-primary:hover,
.btn-primary:focus {
  background-color: #3d593e;
  background-position: 0 -15px;
  border-color: transparent;
}
#encabezado_bienvenidos{
            width: 100%;
            height: 75%;
        /*  background-image: url('../../images/fotos/fondo_negro_transparencia.png'),url('../../images/fotos/fondo.JPG');*/
            background-image: url('../../images/fotos/fondo.JPG');
            /*background: rgba(0, 0, 0, 0.5);*/
            background-position:bottom;
            background-size: cover;
            background-repeat: no-repeat;
            background-attachment: fixed;
}
.navbar{
    border-radius: 0px;    
    position: relative;
    min-height: 50px;
    margin-bottom: 0px;
    border: 1px solid transparent;
}
.logos_instituciones{
   display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: row;
    -ms-flex-direction: row;
    flex-direction: row;
    -webkit-flex-wrap: nowrap;
    -ms-flex-wrap: nowrap;
    flex-wrap: nowrap;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-align-content: stretch;
    -ms-flex-line-pack: stretch;
    align-content: stretch;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;    
}