How to put a small asterik on top of required fields, instead of making them red

How do I Put a small asterik on fields to show them they are required, instead of OOO way of making them red

You could add some custom CSS. For example an asterik after the label on a field editor looks like this.

.nx-basicfieldeditor-item-label.required:after&nbsp;{<br>content:&nbsp;'*';<br>}