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How do we remove the Browser blue focus on TAB line once we have restyled our focus states?

Focus state is important for WCAG 2.4.7 accessibility.
I have created my own states for links within the design style of the website, but when I TAB through the page, the browser blue focus line is still visible. This destroys my beautiful design!

From I tried putting:

:focus {
outline: 0;

into the Project Settings > Custom Code > Head code, but this just put the code as text at the top of the page.

Clearly I need to keep the TAB focus, but I want it styled my way.
I’m using Chrome, if that makes any difference.

Here is my site Read-Only:

I needed to add the style tags!

/* remember to define focus styles! */ :focus { outline: 0; }