I’m working in this form. Its design is exactly like this:

Right now I’m at this stage, so I am working on some little details:

As you will be able to see, the "Your text…" is stuck to the top left corner of the textarea. I’m trying to find a way to manipulate this via CSS if possible. I just need to apply some margin/padding to the text inside the textarea. If this is not possible with CSS I’m open for suggestions.
How can I manipulate the text inside the textarea via CSS?
You can use CSS
paddingproperty: