Copy the default chart CSS to the resource database

src/ag.gresource.xml

@@ -4,6 +4,7 @@
     <file>ui/astrognome.ui</file>
     <file>ui/ag-window.ui</file>
     <file>ui/ag-preferences.ui</file>
+    <file>ui/chart-default.css</file>
 
     <file>default-icons/planet-sun.svg</file>
   </gresource>

src/resources/ui/chart-default.css

@@ -0,0 +1,72 @@
+circle.thick {
+    fill: none;
+    stroke-width: 2.5;
+    stroke: #0000cc;
+}
+
+circle.thin {
+    fill: none;
+    stroke-width: 1;
+    stroke: #0000cc;
+}
+
+line.degree-thick {
+    stroke-width: 2;
+    stroke: #0000cc;
+}
+
+line.degree-thin {
+    stroke-width: 1;
+    stroke: #0000cc;
+}
+
+line.house-cusp {
+    stroke-width: 1;
+    stroke: #0000cc;
+}
+
+.sign {
+    stroke-width: 2;
+    stroke-linecap: butt;
+    stroke-linejoin: bevel;
+}
+
+.sign-fire {
+    fill: none;
+    stroke: #cc2222;
+}
+
+.sign-earth {
+    fill: none;
+    stroke: #22cc22;
+}
+
+.sign-air {
+    fill: none;
+    stroke: #cccc22;
+}
+
+.sign-water {
+    fill: none;
+    stroke: #2222cc;
+}
+
+line.axis {
+    stroke-width: 3;
+    stroke: #000000;
+}
+
+line.axis-end {
+    marker-end: url(#arrow_end);
+}
+
+line.planet-marker {
+    stroke-width: 1.5;
+    stroke: #555555;
+}
+
+path.planet-symbol {
+    stroke-width: 2;
+    fill: none;
+    stroke: #000080;
+}