docs/_xcfg/mkdocs/css/custom.css: css class for gemoji

docs/_xcfg/mkdocs/css/custom.css

@@ -2,4 +2,8 @@
     padding: 0;
     max-height: 85vh;
     overflow-y: auto;
+}
+.gemoji {
+    height: 1em;
+    width: auto;
 }