One common issue when trying to change styles in JavaScript is that the JavaScript may be running before the DOM is fully loaded. Ensure your script runs at the end of the body or use an event listener for 'DOMContentLoaded'.
Another potential issue is the CSS specificity. If there are other CSS rules applying to #myDiv that have higher priority, they may override your JavaScript styles.
Lastly, check the console for any potential warnings or issues with how the elements are being targeted. Although no errors may show, there could be quirks affecting execution.
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