fix style.fill for markdown

ci/release/changelogs/next.md

@@ -12,3 +12,4 @@
 - Fixes styles in connections not overriding styles set by globs [#1857](https://github.com/terrastruct/d2/pull/1857)
 - Fixes `null` being set on a nested shape not working in certain cases when connections also pointed to that shape [#1830](https://github.com/terrastruct/d2/pull/1830)
 - Fixes edge case of bad import syntax crashing using d2 as a library [#1829](https://github.com/terrastruct/d2/pull/1829)
+- Fixes `style.fill` not applying to markdown [#1872](https://github.com/terrastruct/d2/pull/1872)

d2renderers/d2svg/d2svg.go

@@ -1370,7 +1370,9 @@ func drawShape(writer, appendixWriter io.Writer, diagramHash string, targetShape
 			if targetShape.FontSize != textmeasure.MarkdownFontSize {
 				styles = append(styles, fmt.Sprintf("font-size:%vpx", targetShape.FontSize))
 			}
-
+			if targetShape.Fill != "" && targetShape.Fill != "transparent" {
+				styles = append(styles, fmt.Sprintf(`background-color:%s`, targetShape.Fill))
+			}
 			if !color.IsThemeColor(targetShape.Color) {
 				styles = append(styles, fmt.Sprintf(`color:%s`, targetShape.Color))
 			}

e2etests/stable_test.go

@@ -1925,7 +1925,7 @@ a line of text and an
 
 walk into a bar.
 | {
-	style.stroke: darkorange
+	style.font-color: darkorange
 }
 
 container -> no container
@@ -1935,7 +1935,7 @@ they did it in style
 |
 
 no container.style: {
-	stroke: red
+	font-color: red
 	fill: "#CEEDEE"
 }
 `,