@keyframes left-pane-toggle-button-expand {
    from {
        rotate: 0deg;
    } to {
        rotate: 180deg;
    }
}

@keyframes left-pane-toggle-button-collapse {
    from {
        rotate: 180deg;
    } to {
        rotate: 360deg;
    }
}

.layout-vertical .left-pane-toggle-button::before {
    display: block;
}

.layout-vertical .left-pane-toggle-button.action-collapse::before {
    rotate: 360deg;
    animation: left-pane-toggle-button-collapse 600ms ease-in-out;
}

.layout-vertical .left-pane-toggle-button.action-expand::before {
    rotate: 180deg;
    animation: left-pane-toggle-button-expand 600ms ease-in-out;
}