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was an issue remaining. The document used dark theme and the content in the external page used white background.</p><p id="0afe"><b>Hack 2: </b>Use dark-reader to automatically generate css for your external page</p><p id="f222">You can use <a href="https://darkreader.org/">dark-reader</a> to automatically apply dark style to your page. There are two options. First is to use dark-reader in your project via npm and apply dark theme automatically. For my case, this was a bit overkill and I choose the second option. Second option is to generate and export css file corresponding to dark theme of your external page and then adding that style-sheet to our <code>iframe</code>.</p><p id="df41">First install the <a href="https://darkreader.org/">dark-reader</a> add-on/extension to your browser. I have done it on Firefox. Then open your external page in that browser and enable the dark-mode in dark-reader add-on.</p><figure id="54a0"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/1*akq4Mmrutw6XTVdZMY9VBQ.png"><figcaption>dark-reader add-on in Mozilla Firefox</figcaption></figure><p id="ded5">When you enable dark-mode, the dark-reader has generated and applied appropriate styling to make your page dark-themed. It works great. You can also tweak around and set brightness, and contrast as well as use developer tools to further customize the design. Once you are happy with the design, click on the dark-reader browser-action button to open the popup menu and click on settings.</p><figure id="af34"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/1*B_-rTeDGalYJ-Ci6nyyapg.png"><figcaption></figcaption></figure><p id="0ea2">This will open up the settings view as displayed below.</p><figure id="bac9"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/1*dqdeQaWkTj38obrpRLEoVg.png"><figcaption></figcaption></figure><p id="1b63">Click on Manage settings and then on <b>Export Dynamic Theme</b>.</p><figure id="504a"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/1*eoK7sNZcYxZF-xWQ3NjEIg.png"><figcaption></figcaption></figure><p id="2bb4">Great job! This will download a css file that you can add to your page to apply the styles for dark theme. Hmmm… So far so g
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ood. I believe most of you would do the rest of the stuff on your own, but for the sake of completeness let us add a few lines of code to the event-listeners that we created in Hack1.</p><p id="2a64">Save the css file that was downloaded by the dark-reader as <code>dark-theme.css </code>in the <code>/public</code> directory of your Next.js app. Now, add following lines inside the <code>"load"</code> event-listener.</p><div id="d14f"><pre>const link <span class="hljs-operator">=</span> doc.createElement(<span class="hljs-string">"link"</span>)<span class="hljs-comment">;</span></pre></div><div id="e451"><pre><span class="hljs-attr">link.rel</span> = <span class="hljs-string">"stylesheet"</span><span class="hljs-comment">;</span></pre></div><div id="d811"><pre><span class="hljs-attr">link.href</span> = <span class="hljs-string">"/dark-theme.css"</span><span class="hljs-comment">;</span></pre></div><div id="214b"><pre>doc.head.appendChild(link)<span class="hljs-comment">;</span></pre></div><p id="caa5">Next time when you do this, you will be able to add existing HTML files to your project with custom themes in much lesser time than the time you spent reading this document.</p><p id="3a9a">Wish you all the best and happy coding!</p><p id="ad6f">Interested in building career in web development? Checkout E-degree in JS Frameworks</p><div id="2976" class="link-block">
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