a.logo {text-indent: -500px;background: url(logo-sm.png);height: 40px;width: 120px;margin-top: 7px}

#nk-app-name, a.o365sx-appBrandLink {
    background: url(logo-sm.png);
    background-repeat: no-repeat;
    text-indent: -500px;
    width: 120px;
	background-position-y: center;
}