Moved code into src folder. Added build for component library.

src/components/input/ThemeButton.js

@@ -0,0 +1,38 @@
+import { useTransition, animated } from 'react-spring';
+import { Button, Icon } from 'react-basics';
+import useTheme from 'components/hooks/useTheme';
+import Icons from 'components/icons';
+import styles from './ThemeButton.module.css';
+
+export function ThemeButton() {
+  const { theme, saveTheme } = useTheme();
+
+  const transitions = useTransition(theme, {
+    initial: { opacity: 1 },
+    from: {
+      opacity: 0,
+      transform: `translateY(${theme === 'light' ? '20px' : '-20px'}) scale(0.5)`,
+    },
+    enter: { opacity: 1, transform: 'translateY(0px) scale(1.0)' },
+    leave: {
+      opacity: 0,
+      transform: `translateY(${theme === 'light' ? '-20px' : '20px'}) scale(0.5)`,
+    },
+  });
+
+  function handleClick() {
+    saveTheme(theme === 'light' ? 'dark' : 'light');
+  }
+
+  return (
+    <Button variant="quiet" className={styles.button} onClick={handleClick}>
+      {transitions((style, item) => (
+        <animated.div key={item} style={style}>
+          <Icon className={styles.icon}>{item === 'light' ? <Icons.Sun /> : <Icons.Moon />}</Icon>
+        </animated.div>
+      ))}
+    </Button>
+  );
+}
+
+export default ThemeButton;