fix: Fix emoji display in pyodide fence for themes other than Material

Issue-83: #83
PR-84: #84

Author: pawamoy

src/markdown_exec/pyodide.css

@@ -47,4 +47,9 @@ html[data-theme="dark"] {
 .pyodide-clickable {
     cursor: pointer;
     text-align: right;
-}
+}
+
+/* For themes other than Material. */
+.pyodide .twemoji svg {
+    width: 1rem;
+}