#main-toolbar button:active,
#main-toolbar button.active {
    background-color: #ddd;
}

#activity-button {
    background-image: url(../activity/activity-icon.svg);
}

#toggle-grid-button {
    background-image: url(../icons/toggle-grid.svg);
}

#toggle-hemisphere-button {
    background-image: url(../icons/toggle-hemisphere.svg);
}

#save-image-button {
    background-image: url(../icons/save-image.svg);
}