theme.json

{
     "button":
     {
         "colours":
         {
             "normal_bg": "#25292e",
             "hovered_bg": "#35393e",
             "disabled_bg": "#25292e",
             "selected_bg": "#25292e",
             "active_bg": "#193784",
             "normal_text": "#c5cbd8",
             "hovered_text": "#FFFFFF",
             "selected_text": "#FFFFFF",
             "disabled_text": "#6d736f",
             "active_text": "#6d736f",
             "normal_border": "#AAAAAA",
             "hovered_border": "#B0B0B0",
             "disabled_border": "#808080",
             "selected_border": "#8080B0",
             "active_border": "#8080B0"
         },
         "misc":
         {
             "border_width": "1",
             "shadow_width": "1",
             "tool_tip_delay": "1.0",
             "text_horiz_alignment": "left",
             "text_vert_alignment": "top",
             "text_horiz_alignment_padding": "10",
             "text_vert_alignment_padding": "5"
         }
     }
 }