Add the opening comment tag before the code you'd like to comment out (disable); place the closing tag where you want the disabled portion to end. Nothing between those tags will affect the visual display of a site, helping you to debug the CSS to see

How to add borders to your comment box? How to Change the Background Color of Your Comment Box? If you want to change the background color of your comment box, first define a class for the <textarea> element for giving style to it, then use the CSS

CSS Comments. Comments are used to explain the code, and may help when you edit the source code at a later date. Comments are ignored by browsers. A CSS comment is placed inside the <style> element, and starts with /* and ends with */: