#main > div.col.s12:nth-child(1) {
	-webkit-background-size: cover;
	-moz-background-size: cover;
	-o-background-size: cover;
	background-size: cover;
	background: url(../images/plantilla_head.jpg) no-repeat center center;
}
span.draggable{
	font-size: 16px;
}
@media(min-width:601px) and (max-width:992px) {
	#main > div.col.s12:nth-child(1) {
		background: url(../images/plantilla_head.jpg) no-repeat center center;
		-webkit-background-size: cover;
		-moz-background-size: cover;
		-o-background-size: cover;
		background-size: cover;
	}
}
@media(max-width:600px) {
	#main > div.col.s12 {
		min-height: 200px;
	}
	#main > div.col.s12:nth-child(1) {
		background: url(../images/plantilla_head.jpg) no-repeat center center;
		-webkit-background-size: cover;
		-moz-background-size: cover;
		-o-background-size: cover;
		background-size: cover;
	}
	#content .section:nth-child(1) > article .col.s12:nth-child(1) > div.col.s12 img,
	#content footer.page-footer .container .row img {
		display: block;
		margin: 10px auto;
		width: 200px;
	}
	#main > div.col.s12:nth-child(2) {
		padding-top: 20px;
	}
	#content footer.page-footer div.footer-copyright {
		min-height: 106px;
	}
}

@media(max-width:823px) {
	#main > div h1, #content > div > header > div > h1 {
		font-size: 39px;
	}
}

#r1_c, #r2_c, #r3_c, #r4_c, #r5_c, #r6_c, #r7_c, #r8_c, #r9_c, #r10_c, #r11_c, #r12_c, #r13_c{
    border: none;
    border-bottom: 1px solid #9e9e9e;
    outline: 0;
    height: 3rem;
    font-size: 1rem;
    margin: 0 0 10px;
    padding: 0;
    text-align: center;
    box-shadow: none;
    box-sizing: content-box;
    transition: all .3s;
    width: 100px;
}
input.correct{
    background-color: #20B828;
    border-radius: 7px;
    color: #fff;
}
.dere{
    float: right;
}
input.incorrect{
    background-color: #ff3d00;
    border-radius: 7px;
    color: #fff;

}