body{

    <!--background-color: #19171d;-->;

    background-color: #19171d;

}

.caja{

    box-shadow: 1px 1px 5px black;
    background: white;
    width: 95%;
    border-radius: 1px;
    color: white;
}

#header{

    height: 50px;
    width: 100%;
    background: #1A9EE2;
    color: white;
    box-shadow: 1px 1px 5px black;

}

a:hover{

    border-bottom: 0px;

}

a{ color: white;}

.atras{

    margin: 0;
    display: inline;
    position: absolute;
    font-size: 25px;
    padding: 10px;

}

/* Estilo app nota */

.agregar{

    width: 100%;
    background: #337ab7;
    text-align: center;
    font-size: 25px;
    color: white;

}

.caja_asignatura{

    font-size: 20px;
    margin: 5px; 
    display: inline;

}

.caja_nota{

    font-size: 25px; 

    text-align: center; 

    margin: 10px 10px 20px 10px;

}

.caja_eliminar{

    background: red;    
    font-weight: bold;   
    width: 50%;    
    text-align: center;    
    color: white;    
    display: inline-block;        
    margin: 0;   
    float: right;
    padding: 5px;

}

.caja_editar{

    background: dodgerblue; 
    font-weight: bold; 
    width: 50%; 
    text-align: center;
    color: white; 
    display: inline-block; 
    margin: 0; 
    padding: 5px;

}

#nombre{

    font-size: 20px; 
    display: inline; 
    line-height: 50px; 
    text-shadow: 1px 1px 1px black;

}

/* Estilos App Examenes */

.popup{

    background: white;
    padding: 25px;

}