Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/smartComponents/ArmorClassBox/ArmorClassBox.tsx

@@ -0,0 +1,65 @@
+import { visuallyHidden } from "@mui/utils";
+import * as React from "react";
+
+import { CharacterTheme } from "@dndbeyond/character-rules-engine/es";
+
+import BoxBackground from "../BoxBackground";
+import ArmorClassBoxSvg from "../Svg/boxes/ArmorClassBoxSvg";
+
+interface Props {
+  armorClass: number;
+  theme: CharacterTheme;
+  onClick?: () => void;
+  className: string;
+}
+
+export default class ArmorClassBox extends React.PureComponent<Props> {
+  static defaultProps = {
+    className: "",
+  };
+
+  handleClick = (evt: React.MouseEvent): void => {
+    const { onClick } = this.props;
+
+    if (onClick) {
+      evt.stopPropagation();
+      evt.nativeEvent.stopImmediatePropagation();
+      onClick();
+    }
+  };
+
+  render() {
+    const { armorClass, className, theme } = this.props;
+
+    let classNames: Array<string> = [className, "ddbc-armor-class-box"];
+
+    return (
+      <section className={classNames.join(" ")} onClick={this.handleClick}>
+        <BoxBackground StyleComponent={ArmorClassBoxSvg} theme={theme} />
+        <h2 style={visuallyHidden}>Armor Class</h2>
+        <div
+          className={`ddbc-armor-class-box__label ${
+            theme.isDarkMode ? "ddbc-armor-class-box__label--dark-mode" : ""
+          }`}
+        >
+          Armor
+        </div>
+        <div
+          className={`ddbc-armor-class-box__value ${
+            theme.isDarkMode ? "ddbc-armor-class-box__value--dark-mode" : ""
+          }`}
+          data-testid="armor-class-value"
+        >
+          {armorClass}
+        </div>
+        <div
+          className={`ddbc-armor-class-box__label ${
+            theme.isDarkMode ? "ddbc-armor-class-box__label--dark-mode" : ""
+          }`}
+        >
+          Class
+        </div>
+      </section>
+    );
+  }
+}