* {
	padding:0;
	margin:0;
}
img {
	border:0;
}
#content {
	width:200px;
	height:36px;
	margin:280px auto 0;
}
#content a {
	width:155px;
	height:36px;
	background:url(images/twitter_logo_gray.png) no-repeat;
	display:block;
}
#content a:hover {
	background:url(images/twitter_logo.png) no-repeat;
	display:block;
}