body, html {
	margin-left:0px;
	margin-top:0px;
	margin-right:0px;
	margin-bottom:0px;
	position:relative;
	height:100%;
	width:100%;
	background-image:url(../images/giris_bg.png);
	background-size:100% 100%;
}.grup_logo {
	padding-top:100px;
}.giris_btn {
	position:relative;
	width:137px;
	height:41px;
	background-image:url(../images/giris.png);
	cursor:pointer;
	margin-top:10px;
}.giris_btn:hover {
	background-image:url(../images/_giris.png);
}.desktop {
	display:block;
}.mobil {
	display:none;
}

@media only screen and (max-width:600px) {
	.desktop {
		display:none;
	}.mobil {
		display:block;
	}
}