Update: Updated gtk theme and added gitignore.

usr/share/themes/gtk-dark-keyitdev/metacity-1/titlebuttons/titlebutton-shade.svg

@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="16"
+   height="16"
+   version="1.1"
+   id="svg11"
+   sodipodi:docname="titlebutton-shade.svg"
+   inkscape:version="1.1.2 (0a00cf5339, 2022-02-04)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs15" />
+  <sodipodi:namedview
+     id="namedview13"
+     pagecolor="#505050"
+     bordercolor="#eeeeee"
+     borderopacity="1"
+     inkscape:pageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="0"
+     showgrid="false"
+     inkscape:zoom="36.375"
+     inkscape:cx="8"
+     inkscape:cy="8"
+     inkscape:window-width="1920"
+     inkscape:window-height="1012"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg11" />
+  <rect
+     x="0"
+     y="6.1035155e-07"
+     width="16"
+     height="16"
+     ry="1.6931001e-05"
+     opacity="0"
+     stroke-width="0.47432"
+     style="paint-order:markers stroke fill"
+     id="rect2" />
+  <g
+     transform="translate(1,1)"
+     enable-background="new"
+     id="g8"
+     style="fill:#7aa2f7;fill-opacity:1">
+    <g
+       transform="translate(-5,-1033.4)"
+       fill-rule="evenodd"
+       id="g6"
+       style="fill:#7aa2f7;fill-opacity:1">
+      <path
+         d="m 12,1047.4 c 3.8659,0 6.9999,-3.134 6.9999,-7 0,-3.866 -3.134,-7 -6.9999,-7 -3.866,0 -7.0001,3.134 -7.0001,7 0,3.866 3.134,7 7.0001,7"
+         fill="#4285f4"
+         id="path4"
+         style="fill:#7aa2f7;fill-opacity:1" />
+    </g>
+  </g>
+</svg>