html,
body {
    height: 100%;
}
html {
    display: table;
    margin: auto;
}
body {
    display: table-cell;
    vertical-align: middle;
}


@media screen and (max-width: 600px) {
    #registerTutor{
    	width: 90%!important;    	
    }

    #registerEstudiante{
    	width: 90%!important;    	
    }
}