This is a known issue filed in Jira already and there is a PR that a community member worked on that looks close to being merged: MM-57096 replaced hardcoded value with a color variable by sohzm · Pull Request #26667 · mattermost/mattermost · GitHub
This is a known issue filed in Jira already and there is a PR that a community member worked on that looks close to being merged: MM-57096 replaced hardcoded value with a color variable by sohzm · Pull Request #26667 · mattermost/mattermost · GitHub