IE11 Did not support css variables

[AtoianAvetik]

Issue description

On IE 11(or lower) markup is broken because css variables not supported.
Please check https://caniuse.com/#feat=css-variables.

Steps to reproduce

Just go to page on IE11. Cookie consent markup is broken.

Current behavior

The styling is not working correctly on IE11 because css variables not supported.

Expected/desired behavior

The styling should working correctly on IE11.

Thanks!