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Adding custom css to the textarea from code used on homepage

How do I add custom css to the textareas? Any css other than width does not have any affect on the style. If I add the same code to a other html file it works.

	textarea {
 	   background-color: green;

	body {
		background-color: red;


The body part works.
Even if i add the options directly to the text field, where it is initialized it has no effect.