If your form looks ok in the preview form, but it’s not ok on the website it means that the theme used on your website is overriding the styling of the Contact Form 7 Style settings.
As a test, can you select a default WordPress theme like twenty-fifteen or twentysixteen to test the same setup?
If it works with the default theme, than you should style your textarea with the CSS editor implemented in the Contact Form 7 Style plugin after activating your custom WordPress theme.
As an alternative you could try to add this snippet to the CSS editor of the Contact Form 7 Style plugin:
body .cf7-style .wpcf7-form-control-wrap input {
width: 200px;
}
body .cf7-style .wpcf7-form-control-wrap textarea {
width: 330px;
}
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