gtk-widgets-borders.css

/* Generic element borders */
.entry,
.button,
.toolbar .button.raised,
.toolbar .raised .button,
.primary-toolbar .button:hover,
.primary-toolbar .button:active,
.primary-toolbar .spinbutton .button,
.primary-toolbar GtkComboBox .button,
.primary-toolbar GtkComboBox.combobox-entry .button,
column-header.button,
column-header .button,
.scale.slider,
GtkSwitch.slider,
.trough,
.trough row,
.scale.trough,
GtkSwitch.trough,
.notebook tab {
    border-radius: 4px;
    border-width: 1px;
    border-style: solid;
    border-color: @alt_border_color;
}

.scrollbar.slider,
.scrollbar.trough,
.check,
.check row,
.view.cell.check,
.radio,
.radio row,
.view.cell.radio {
    box-shadow: inset 0 0 0 1px @alt_border_color;
}

/* Colored element borders */
.button.default,
.toolbar .button.raised.default,
.toolbar .raised .button.default,
.primary-toolbar .button.default:hover,
.primary-toolbar .button.default:active {
    border-radius: 4px;
    border-width: 1px;
    border-style: solid;
    border-color: @colored_border_color;
}

.check:inconsistent,
.check row:inconsistent,
.view.cell.check:inconsistent,
.radio:inconsistent,
.radio row:inconsistent,
.view.cell.radio:inconsistent {
    box-shadow: inset 0 0 0 1px @colored_border_color;
}

/* Suggested action buttons borders */
.suggested-action.button,
.primary-toolbar .suggested-action.button,
.selection-mode.toolbar GtkToolButton.suggested-action .button,
.progressbar,
.progressbar row,
.scale.progressbar,
.scale.trough.highlight,
GtkSwitch.trough:active {
    border-radius: 4px;
    border-width: 1px;
    border-style: solid;
    border-color: @suggested_action_border_color;
}

.check:active,
.check row:active,
.view.cell.check:active,
.radio:active,
.radio row:active,
.view.cell.radio:active {
    box-shadow: inset 0 0 0 1px @suggested_action_border_color;
}

/* Destructive action buttons borders */
.destructive-action.button,
.primary-toolbar .destructive-action.button {
    border-radius: 4px;
    border-width: 1px;
    border-style: solid;
    border-color: @destructive_action_border_color;
}

/* Focused element borders */
.entry:focus,
.button:focus,
.toolbar .button.raised:focus,
.toolbar .raised .button:focus,
.primary-toolbar .button:focus,
.primary-toolbar .spinbutton .button:focus,
.primary-toolbar GtkComboBox .button:focus,
.primary-toolbar GtkComboBox.combobox-entry .button:focus,
column-header.button:focus,
column-header .button:focus,
.scale.slider:active,
/* GtkSwitch.slider:active, */
.scale.trough:focus,
GtkSwitch.trough:focus,
.notebook tab:active:focus {
    border-color: @focused_border_color;
    box-shadow: inset 0 0 0 1px alpha(@focused_border_color, 0.2);
}

.scrollbar.slider:active,
.check:focus,
.check row:focus,
.view.cell.check:focus,
.radio:focus,
.radio row:focus,
.view.cell.radio:focus {
    box-shadow: inset 0 0 0 2px alpha(@focused_border_color, 0.2),
                inset 0 0 0 1px @focused_border_color;
}

/* Focused colored element borders */
.button.default:focus,
.toolbar .button.raised.default:focus,
.toolbar .raised .button.default:focus,
.primary-toolbar .button.default:focus,
.scale.slider.fine-tune:active {
    border-color: @focused_border_color;
    box-shadow: inset 0 0 0 1px alpha(@focused_border_color, 0.2);
}

.scrollbar.slider.fine-tune:active,
.check:inconsistent:focus,
.check row:inconsistent:focus,
.view.cell.check:inconsistent:focus,
.radio:inconsistent:focus,
.radio row:inconsistent:focus,
.view.cell.radio:inconsistent:focus {
    box-shadow: inset 0 0 0 2px alpha(@focused_border_color, 0.2),
                inset 0 0 0 1px @focused_border_color;
}

/* Focused suggested action buttons borders */
.suggested-action.button:focus,
.primary-toolbar .suggested-action.button:focus,
.selection-mode.toolbar GtkToolButton.suggested-action .button:focus,
.scale.progressbar:focus,
.scale.trough.highlight:focus,
GtkSwitch.trough:active:focus {
    border-color: @suggested_action_border_color;
    box-shadow: inset 0 0 0 1px alpha(@theme_selected_fg_color, 0.6);
}

.check:active:focus,
.check row:active:focus,
.view.cell.check:active:focus,
.radio:active:focus,
.radio row:active:focus,
.view.cell.radio:active:focus {
    box-shadow: inset 0 0 0 2px alpha(@theme_selected_fg_color, 0.6),
                inset 0 0 0 1px @suggested_action_border_color;
}

/* Focused destructive action buttons borders */
.destructive-action.button:focus,
.primary-toolbar .destructive-action.button:focus {
    border-color: @destructive_action_border_color;
    box-shadow: inset 0 0 0 1px alpha(@theme_selected_fg_color, 0.6);
}

/* Insensitive element borders */
.entry:insensitive,
.button:insensitive,
.toolbar .button.raised:insensitive,
.toolbar .raised .button:insensitive,
.primary-toolbar .button:active:insensitive,
.primary-toolbar .spinbutton .button:insensitive,
.primary-toolbar GtkComboBox .button:insensitive,
.primary-toolbar GtkComboBox.combobox-entry .button:insensitive,
column-header.button:insensitive,
column-header .button:insensitive,
.scale.slider:insensitive,
GtkSwitch.slider:insensitive,
.trough:insensitive,
.trough row:insensitive,
.scale.trough:insensitive,
GtkSwitch.trough:insensitive,
.notebook tab:insensitive,
.button.default:insensitive,
.toolbar .button.raised.default:insensitive,
.toolbar .raised .button.default:insensitive,
.primary-toolbar .button.default:active:insensitive,
.suggested-action.button:insensitive,
.primary-toolbar .suggested-action.button:insensitive,
.selection-mode.toolbar GtkToolButton.suggested-action .button:insensitive,
.progressbar:insensitive,
.progressbar row:insensitive,
.scale.progressbar:insensitive,
.scale.trough.highlight:insensitive,
GtkSwitch.trough:active:insensitive,
.destructive-action.button:insensitive,
.primary-toolbar .destructive-action.button:insensitive {
    border-color: @insensitive_border_color;
}

.scrollbar.slider:insensitive,
.scrollbar.trough:insensitive,
.check:insensitive,
.check row:insensitive,
.view.cell.check:insensitive,
.radio:insensitive,
.radio row:insensitive,
.view.cell.radio:insensitive {
    box-shadow: inset 0 0 0 1px @insensitive_border_color;
}