.inicio{
	background-position: center center;
	background-repeat: no-repeat;
	background-attachment: fixed;
	background-size: cover;
	background-color: #343a40;
}
.centrar{
 	position: absolute;
  	top:35%;
  	left:50%;
  	width:400px;
  	margin-left:-200px;
  	margin-top:-150px;
  	padding:5px;
}
.footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: red;
    text-align: center;
}
.logo_prim{
	width: 30%;
	height: 70%;
}
@media only screen and (max-width: 1200px) {
	.inicio{
		background-position: unset;
	}
	.footer {
	    position: fixed;
	    left: 0;
	    bottom: 0;
	    width: 100%;
	    background-color: red;
	    text-align: center;
	}
}
@media only screen and (max-width: 768px) {
	.inicio{
		background-position: unset;
	}
	.footer {
	    position: fixed;
	    left: 0;
	    bottom: 0;
	    width: 100%;
	    background-color: red;
	    text-align: center;
	}
}
@media only screen and (max-width: 425px) {
	.inicio{
		background-position: unset;
	}
	.footer {
	    position: fixed;
	    left: 0;
	    bottom: 0;
	    width: 100%;
	    background-color: red;
	    text-align: center;
	}
}