@mixin ag-theme-base-part-sidebar {
 
    .ag-side-bar {
        position: relative;
    }

    .ag-tool-panel-wrapper {
        width: ag-param(side-bar-panel-width);
        @include ag-color-property(background-color, control-panel-background-color);
    }

    .ag-side-buttons {
        padding-top: ag-param(grid-size) * 4;
        width: ag-param(icon-size) + 4;
        position: relative;
        @include ag-color-property(color, foreground-color);
        overflow: hidden;
    }

    button.ag-side-button-button {
        @include ag-inherit-text-styles();
        background: transparent;
        padding: ag-param(grid-size) * 2 0 ag-param(grid-size) * 2 0;
        @if ag-param(borders-side-button) {
            width: calc(100% + 1px);
        } @else {
            width: 100%;
        }
        margin: 0;
        min-height: ag-param(grid-size) * 18;
        background-position-y: center;
        background-position-x: center;
        background-repeat: no-repeat;

        border: none;
        @include ag-border(side-button, (top, bottom));
        $border-top-color: transparent;
        $border-bottom-color: transparent;

        &:focus {
            box-shadow: none;
        }
    }

    @include ag-keyboard-focus((ag-side-button-button), 4px);

    .ag-selected .ag-side-button-button {
        @if ag-param(borders-side-button) {
            @include ag-color-property(background-color, control-panel-background-color);
            @include ag-color-property(border-top-color, border-color);
            @include ag-color-property(border-bottom-color, border-color);
        }
    }

    .ag-side-button-icon-wrapper {
        margin-bottom: 3px;
    }

    // sidebar visually on left
    .ag-ltr .ag-side-bar-left,
    .ag-rtl .ag-side-bar-right {
        @include ag-border(primary, right);
        .ag-tool-panel-wrapper {
            @include ag-border(primary, left);
        }

        .ag-side-button-button {
            border-right: ag-param(selected-tab-underline-width) solid transparent;
            @if ag-param(selected-tab-underline-transition-speed) {
                transition: border-right ag-param(selected-tab-underline-transition-speed);
            }
            
            @if ag-param(borders-side-button) {
                // this enlarges the tab button to cover the tool panel border
                margin-right: -1px;
                padding-right: 1px;
            }
        }

        .ag-selected .ag-side-button-button {
            @include ag-color-property(border-right-color, selected-tab-underline-color);
        }
    }

    // sidebar visually on right
    .ag-rtl .ag-side-bar-left,
    .ag-ltr .ag-side-bar-right {
        @include ag-border(primary, left);
        
        .ag-tool-panel-wrapper {
            @include ag-border(primary, right);
        }

        .ag-side-button-button {
            border-left: ag-param(selected-tab-underline-width) solid transparent;
            @if ag-param(selected-tab-underline-transition-speed) {
                transition: border-left ag-param(selected-tab-underline-transition-speed);
            }
            
            @if ag-param(borders-side-button) {
                // this enlarges the tab button to cover the tool panel border
                margin-left: -1px;
                padding-left: 1px;
            }
        }

        .ag-selected .ag-side-button-button {
            @include ag-color-property(border-left-color, selected-tab-underline-color);
        }
    }
    
}