.header{ height: 150px; border-bottom: 25px solid #243b71; border-top: 25px solid #243b71; }
.header div{
	background-image: url('../images/pruebas-logo.jpg');
	background-size: contain;
    height: 100%;
    background-repeat: no-repeat;
}
.footer{ height: 50px; background-color: #243b71; color: #fff; position: absolute; bottom: 0; }
.footer div{ text-align: center; margin-top: 15px; }

.formulario, .margin-top{ margin-top: 50px; }
.boton_enviar{ width: 100%; }
.error{ color: red; }
div.error{ margin-top: 20px; text-align: center; }

.clear-fix{ clear: both; }