Craft CMS cookie notice plugins
There are several of these around. As well as a manual setup, I've tried the following:
Using plugins is generally quicker and better value for the client. There's no point re-inventing the wheel at the client's expense. So I wanted to stop doing it manually each time and use a third-party plugin which could easily be styled, content-edited, etc.
cookie consent plugin
Initially I didn't like the fact this plugin also inserted Google Analytics tracking code but it was a cinch to turn off. Editing the plugin's template files is super-easy - both the HTML and the CSS are in the same file and I was quickly able to get it looking how I wanted, with my own content in there. For sure, I recommend this one and will be using it again in the future.