1 KB alternative to Cookie Notice WordPress Plugin - https://wpspeedmatters.com/fastest-cookie-consent-wordpress-plugin/

cookie-1kb.html

<p id="cookie-notice">This website uses cookies to ensure you get the best experience on our website<br><button onclick="acceptCookie();">Got it!</button></p>

<style>#cookie-notice{color:#fff;font-family:inherit;background:#596cd5;padding:20px;position:fixed;bottom:10px;left:10px;width:100%;max-width:300px;box-shadow:0 10px 20px rgba(0,0,0,.2);border-radius:5px;margin:0px;visibility:hidden;z-index:1000000;box-sizing:border-box}#cookie-notice button{color:inherit;background:#3842c7;border:0;padding:10px;margin-top:10px;width:100%;cursor:pointer}@media only screen and (max-width:600px){#cookie-notice{max-width:100%;bottom:0;left:0;border-radius:0}}</style>

<script>function acceptCookie(){document.cookie="cookieaccepted=1; expires=Thu, 18 Dec 2030 12:00:00 UTC; path=/",document.getElementById("cookie-notice").style.visibility="hidden"}document.cookie.indexOf("cookieaccepted")<0&&(document.getElementById("cookie-notice").style.visibility="visible");</script>