Try this safari-only CSS

Bump up font size because rounded is a little small

src/index.css

@@ -90,6 +90,12 @@ body {
   word-wrap: break-word;
   overflow-wrap: break-word;
 }
+/* Safari-only: https://www.bram.us/2021/06/23/css-at-supports-rules-to-target-only-firefox-safari-chromium/#safari */
+@supports (background: -webkit-named-image(i)) {
+  body {
+    font-size: 17px;
+  }
+}
 
 a {
   color: var(--link-color);