WP File Manager

Name	Action
..
index.html	Edit
xml.css	Edit
xml.js	Edit

Editing: xml.css

span.xml-tag {color: #a0b;} span.xml-attribute {color: #281;} span.xml-attname {color: #00f;} span.xml-comment {color: #a70;} span.xml-cdata {color: #48a;} span.xml-processing {color: #999;} span.xml-entity {color: #a22;}