Tip 1: Use inline styles, because who needs CSS files?
IE6 is slow, but it's not as slow as your sanity when it comes to loading CSS files. Just add your styles right in the HTML, and you'll save yourself the trouble of waiting for the stylesheets to load.
<style>
body {
background-color: #FFD700;
}
</style>
Tip 2: Use "quirks" mode, because who needs standards?
IE6 is all about being flexible, like a yoga instructor with a bad back. Use "quirks" mode to turn off those pesky standards and just make it work.
Warning: Using "quirks" mode may cause your website to look like it was made in 1999.
Tip 3: Use tables for layout, because they're still a thing.
Tables, tables, everywhere! They're like the Swiss Army knife of web development. Use them for everything, and you'll be just fine (or not).
<table>
<tr>
<td>Content goes here</td>
</tr>
</table>