$tool-opacity: dynamic(0.8);
$tool-hovered-opacity: dynamic(1);
$tool-pressed-opacity: dynamic(0.8);

$tool-boxscroller-tabbar-ui: dynamic((
    color: #fff,
    opacity: .5,
    margin: 4px 0 0 0,
    hovered-opacity: .6,
    pressed-opacity: .7,
    width: 24px,
    height: 24px,
    width-big: 32px,
    height-big: 32px
));