If you got a greasemonkey or a violentmonkey chrome extension you can customise the style with this snippet:
// ==UserScript==
// @name Wolfery highlight tweak
// @namespace Violentmonkey Scripts
// @match https://wolfery.com/
// @grant GM_addStyle
// @version 1.0
// @author Shinyuu
// @description 10/16/2022, 5:12:42 PM
// ==/UserScript==
GM_addStyle (`
.common--formattext span.highlight {
color: inherit !important;
background: inherit !important;
padding: inherit !important;
border-radius: inherit !important;
}
`);