Allow using classname and class

src/IconButton.tsx

@@ -5,7 +5,12 @@ export default function IconButton({
    ...props
 }: JSX.HTMLAttributes<HTMLButtonElement>) {
    return (
-      <button className={"ht-btn ht-btn-icon " + (className || "")} {...props}>
+      <button
+         className={
+            "ht-btn ht-btn-icon " + (className || "") + (props.class || "")
+         }
+         {...props}
+      >
          {children}
       </button>
    );