Add a circle with the background colour around day parts

…so it smoothens the edges!

src/main.rs

@@ -303,13 +303,20 @@ fn gen_svg() -> Document {
 
     let nighttime_path = get_range_path(image_width, marker_radius, "night-time", dawn, dusk);
 
+    let marker_circle = Circle::new()
+        .set("class", "marker")
+        .set("cx", image_width / 2)
+        .set("cy", image_width / 2)
+        .set("r", marker_radius);
+
     let day_parts_group = Group::new()
         .set("id", "day-parts")
         .add(daytime_circle)
         .add(golden_hour_path)
         .add(sun_disc)
         .add(blue_hour_path)
-        .add(nighttime_path);
+        .add(nighttime_path)
+        .add(marker_circle);
 
     let moon_circle = Circle::new()
         .set("class", "moon-background")