.css file

As I am a learner, I don’t know how to create a new .css file to write the contents.
Here is my link to the exercise which I am learning and where I am stucked.
If anyone knows the solution please help.


Same as it was you begin in HTML5 CSS is a type of program that will
transform your data in HTML5 like a twink in microsoft windows. It will
transform your white page in a colorful environment and more. Just read the
instruction step by step on your left panel don’t move an advance step just
follow instruction that’s the only thing you have to do first as of now
till you understand the essence of CSS.

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