#container #header #library-logo, #container #mini-header .mini-library-logo 
{
	background: url(http://libweb01.ichigak-net.ed.jp/opac4/unique/images/logo_0001.gif?v=20180420) no-repeat left center;
	background-size: auto;
}
#container #header #library-logo
{
	background-size: contain;
}
#container #mini-header .mini-library-logo 
{
	background-size: contain;
}