a.logo {text-indent: -500px;background: url(gp.png);height: 42px;width: 160px;margin-top: 8px;background-repeat: no-repeat}
body {color:#333}
ul.sidebar-menu li > a {color:white}
a {color: #337ab7}

#nk-app-name, a.o365sx-appBrandLink {
    background: url(gp.png);
    background-repeat: no-repeat;
    text-indent: -500px;
    width: 200px;
}