blue-recorder/src/styles/global.css

#area_chooser_window {
    background-color: alpha(@theme_selected_bg_color, 0.1);
    border: 3px dashed @theme_selected_bg_color;
    border-radius: 0px;
}

#area_set_button {
    color: @theme_selected_fg_color;
    background: @theme_selected_bg_color;
}

#area_grab_button:checked {
    color: @theme_selected_fg_color;
    background: @theme_selected_bg_color;
}

#screen_grab_button:checked {
    color: @theme_selected_fg_color;
    background: @theme_selected_bg_color;
}

#window_grab_button:checked {
    color: @theme_selected_fg_color;
    background: @theme_selected_bg_color;
}

#delay_window {
    border: 3px solid @theme_selected_bg_color;
}

#delay_window_label {
    font-size: 350%;
    font-weight: 250;
}

#delay_window_title {
    font-size: 120%;
    font-weight: 50;
}