I agree with pretty much everything everyone has said here.
If you really want to go the CSS way, here’s how you can make your CSS modifications only apply to non-admins:
In the Head
tab of your theme, write this:
<script type="text/discourse-plugin" version="1.4.0">
let currentUser = api.getCurrentUser();
if (currentUser.admin == true) {
document.querySelector("body").classList.add("is-admin");
}
</script>
Wrap all your CSS rules with body:not(.is-admin) {
(your CSS) }
such as:
body:not(.is-admin) {
#main {
background: pink;
}
}
In my example, the pink background will be applied to everyone but the admin users.