body {
	padding-left:10em;
	padding-right:10em;
	font-family: Arial;
}

h1 {
	font-family: Arial;
	text-align:center;
	color: #0000ee;	
}

h2 {
	font-family: Arial;
	color: #0000ee;	
}

h3 {
	font-family: Arial;
	color: #0000ee;	
}

.aviso {
	color: green;
	text-align:center;
}

p {
	font-family: Arial;
}

#encabezado {
	height: 100;
	
}

#principal {
	height: '90%';

}

#ejercicio {
	font-family: Arial;
	text-align:center;
	font-size:24px;
}
	
#pregunta {
	font-family: Arial;
	text-align:left;
	font-size:16px;
}

#problema {
	font-family: Arial;
	text-align:center;
	font-size:20px;
}

.lista {
	font-size:16px;
}

#exponente {
	vertical-align:80%;
	
}

#correcto {
	font-family: Arial;
	text-align:center;
	font-size:16px;
	color: #009900;	
}

#incorrecto {
	font-family: Arial;
	text-align:center;
	font-size:16px;
	color: #ee0000;	
}

#retroalimentacion {
	font-family: Arial;
	text-align:center;
	font-size:20px;
	color: #222222;	
}

input[type=number]{
    width: 70px;
}

footer {
	border: 1px solid blue;
	text-align: center;
	background: #f0f0ff;
	font-size:12px;
	height:50px;	
	display:block; 
	width: 100%;
	height: 50;
	float: left;
}

.cuestionario {
	font-family: Arial;
	font-size:12px;
	padding-left:12em;
}

.unidad {
	font-family: Arial;
	font-size:20px;
	color:blue;
	padding-left:4em;
	
}

.tema {
	font-family: Arial;
	font-size:16px;
	padding-left:8em;
}

.derecha {
	text-align: right;
}

.proof {
		
	padding-right: 0.5in;
	padding-left: 0.5in;
	
}

.qed {
	text-align: right;
	padding-right: 1in;
	
	font-size: smaller;
	}