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●→■ Basic Unround Everything Everywhere

For test

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/* ==UserStyle==
@name           ●→■ Basic Unround Everything Everywhere 
@description    For test
@namespace      myfonj
@version        1.0.0
@license        CC0 - Public Domain
==/UserStyle== */
/*
For test https://greasyfork.org/en/scripts/408378-unround-everything-everywhere/discussions/312217
Changelog
1.0.0 init, just the core rule from https://greasyfork.org/en/scripts/408378
*/

*:not(#u#n#r#o#u#n#d):not(
 input[type="radio" i]
):not(
 input[type="radio" i] + label
):not(
 /* Outlook */
 input[type="radio" i] + [aria-hidden="true" i]:empty:has(+ label)
):not(
 /* Gmail */
 input[type="radio" i] + *:not(:has(:not(:empty))) *
)
{
 &,
 &::before,
 &::after {
  border-radius: 0 !important;
 }
}