Portfolio - Feedback On Style of Comment Box In Form

This is my first time posting. I am new to coding and am almost through with the first section of FCC’s Front End Development, which is the Portfolio page. Portfolio Page

I am wondering if anyone can help me with my code for the textbox in the Contact form area, here is what I have:
From line 58 of the HTML
…textarea rows=“4” cols=“50” name=“comments” maxlength=“500” placeholder=“Comments…” class=“col-xs-8 col-sm-5 col-md-5 btn” ></textarea…

This will not behave like a textarea element (making multi-line text), it will just keep typing and create a scroll bar to scroll horizontally rather than returning to a new line. If class=“col-xs-8 col-sm-5 col-md-5 btn” is erased, it will have multi-line text, but does not look like the other form elements.

Is it possible for me to keep the style of the text box and also have normal functionality?

Also, any feedback in general would be helpful. Thank you.