diff --git a/layouts/shortcodes/git-heatmap.html b/layouts/shortcodes/git-heatmap.html
index 1a65e5b..0000372 100644
--- a/layouts/shortcodes/git-heatmap.html
+++ b/layouts/shortcodes/git-heatmap.html
@@ -8,6 +8,7 @@
   --color-mid:   {{ $p.color_mid }};
   --color-high:  {{ $p.color_high }};
 }
+#heatmap { display: flex; justify-content: center; }
 #heatmap text { font-family: inherit; fill: currentColor; }
 #tooltip {
   position: fixed;