.SimulinkModelIcon_icon,
.Chart_icon,
.State_icon,
.Transition_icon { background-image: url('icon.png'); width: 16px; height: 16px; }

.SimulinkModelIcon_icon { background-position: -0px; }
.Chart_icon { background-position: -16px; }
.State_icon { background-position: -32px; }
.Transition_icon { background-position: -48px; }