Unable to increase Width of Text Area Field

I found another post related to this and followed the instruction to add !important after the width:nnnpx. I used the CSS tool in Designer.  However, although I can reduce the width, I cannot expand it beyond a certain point.  Is there a limit and if not, how do I change the width of the Textarea field?

I checked but could not locate the !important added:

Please add this css code :

.form-textarea {

    width: 1000px !important;

    max-width: 1200px !important;

    }

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