numix-gtk-theme/gtk-3.0/scss/widgets/_choosers.scss

/***************
 ! Color chooser
****************/

@include exports("colorchooser") {
    GtkColorSwatch {
        &, &:selected {
            border: 1px solid fade-out($black, .9);
            border-radius: $roundness - 1px;
            background-color: transparent;
            background-clip: border-box;

            &:hover { border-color: fade-out($black, .7); }
        }

        &.color-light:selected:hover, &.color-dark:selected:hover { background-image: none; }

        &.left, &:first-child {
            border-top-left-radius: $roundness;
            border-bottom-left-radius: $roundness;
        }

        &.right, &:last-child {
            border-top-right-radius: $roundness;
            border-bottom-right-radius: $roundness;
        }

        &:only-child { border-radius: $roundness; }

        &.top {
            border-top-left-radius: $roundness;
            border-top-right-radius: $roundness;
        }

        &.bottom {
            border-bottom-left-radius: $roundness;
            border-bottom-right-radius: $roundness;
        }

        GtkColorEditor & {
            border-radius: $roundness;

            &.color-dark:hover, &.color-light:hover {
                background-image: none;
                border-color: fade-out($black, .7);
            }
        }
    }

    GtkColorChooserWidget #add-color-button {
        background-clip: padding-box;
        border-color: fade-out($black, .9);
        background-color: shade($bg_color, .95);
        color: $fg_color;

        &:hover {
            border-color: fade-out($black, .7);
            background-color: shade($bg_color, .9);
            color: $fg_color;
        }
    }

    .color-active-badge {
        &, &:selected {
            border-width: 2px;
            border-style: solid;
            background-color: transparent;
        }

        &.color-light {
            &, &:hover {
                border-color: fade-out($black, .7);
                color: fade-out($black, .7);
            }
        }

        &.color-dark {
            &, &:hover {
                border-color: fade-out($white, .7);
                color: fade-out($white, .7);
            }
        }
    }

    GtkColorButton.button { padding: $spacing; }
}


/***********************
! Font and file choosers
************************/

@include exports("miscchoosers") {
    GtkFontButton, GtkFileChooserButton {
        .separator {
            /* always disable separators */
            -GtkWidget-wide-separators: true;
            -GtkWidget-horizontal-separator: 0;
            -GtkWidget-vertical-separator: 0;
        }

        GtkLabel:last-child { color: currentColor; }

        GtkImage:last-child { color: currentColor; }
    }

    GtkFileChooser {
        .pane-separator {
            &, &:hover {
                border-width: 0 1px 0 0;
                border-style: solid;
                border-color: currentColor;
                background-color: $bg_color;
                color: shade($bg_color, ($contrast + .1));
            }
        }

        /* for fallback when header bar not used */
        .dialog-action-box {
            border-width: 1px 0 0;
            border-style: solid;
            border-color: shade($bg_color, .7);
        }
    }
}