html {
    height: 100%;
}
body {
    background: url('../images/plaza.jpg') no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    margin: 0px;
    min-height: 100%;
    display: flex;
  justify-content: center;
  align-items: center;
}

#medio-background {
    z-index: 1;
    width: 100%;
    padding-bottom: 25px;
    background-color: #708041;
    text-align: center;
}

/* BOTON */
.a_demo_five {
    text-align: center;
    padding-left: 10px;
    padding-right: 10px;
	background-color:#3bb3e0;
	width: 300px;
	display:inline-block;
	font-family: 'Open Sans', sans-serif;
	font-size:18px;
	text-decoration:none;
	color:#fff;
	position:relative;
	margin-top:150px;
	padding-bottom:10px;
	padding-top:10px;
	background-image: linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
	background-image: -o-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
	background-image: -moz-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
	background-image: -webkit-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
	background-image: -ms-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
	background-image: -webkit-gradient(
	linear,
	left bottom,
	left top,
	color-stop(0, rgb(44,160,202)),
	color-stop(1, rgb(62,184,229))
	);
	-webkit-border-bottom-right-radius: 5px;
	-webkit-border-bottom-left-radius: 5px;
	-moz-border-radius-bottomright: 5px;
	-moz-border-radius-bottomleft: 5px;
	border-bottom-right-radius: 5px;
	border-bottom-left-radius: 5px;
	-webkit-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785;
	-moz-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785;
	-o-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785;
	box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785;
}

.a_demo_five:active {
	top:0px;
	background-image: linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
	background-image: -o-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
	background-image: -moz-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
	background-image: -webkit-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
	background-image: -ms-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
	background-image: -webkit-gradient(
	linear,
	left bottom,
	left top,
	color-stop(0, rgb(62,184,229)),
	color-stop(1, rgb(44,160,202))
	);
	-webkit-box-shadow: inset 0px 4px 1px #0b698b, 0px 2px 0px 0px #156785;
	-moz-box-shadow: 0px 2px 0px 1px #156785;
	-o-box-shadow: 0px 2px 0px 1px #156785;
	box-shadow: inset 0px 4px 1px #0b698b, 0px 2px 0px 0px #156785;
}
.a_demo_five::before {
    padding-left: 10px;
    padding-right: 10px;
	background-color:#fff;
	background-image:url('../images/factura.png');
	background-repeat:no-repeat;
	background-position:center center;
	content:"";
	width:300px;
	height:150px;
	position:absolute;
	top:-139px;
	left:0px;
	margin-top:-11px;
	z-index:-1;
	-webkit-border-top-left-radius: 5px;
	-webkit-border-top-right-radius: 5px;
	-moz-border-radius-topleft: 5px;
	-moz-border-radius-topright: 5px;
	border-top-left-radius: 5px;
	border-top-right-radius: 5px;
}
.a_demo_five:active::before {
	top: -137px;	
	-webkit-box-shadow: 0px 3px 0px #ccc;
	-moz-box-shadow: 0px 3px 0px #ccc;
	-o-box-shadow: 0px 3px 0px #ccc;
	box-shadow: 0px 3px 0px #ccc;
}