.adm-bxready .adm-main-menu-item-icon {
    background: url('bxr_panel_icons.png') no-repeat;
    background-position: center 0px;
    height: 54px;
}
.adm-main-menu-item-active.adm-bxready .adm-main-menu-item-icon {
    background-position: center -62px;
    height: 54px;
}

.adm-bxready:hover .adm-main-menu-item-icon {
    background-position: center -62px;
    height: 54px;
}