Use only visual editor

I have added the above code to style.css but somehow I am still seeing the text editor. Could help me to take a look again?

My website is at egallop.com.

Thx,

You can add the following code to the style.css file, I have checked on our demo and it works fine:

button#question-content-html { display: none; }
button#dwqa-answer-content-html { display: none; }

Still, it is not working for me. Could it be done through code? To disable only the text mode in Q&A form?

I have checked on our demo and it still works fine, you can send me username & password of your site for further checking, I will help you resolve this issue.

Could you use gmail or FB account to register an account at egallop.com? I will change the account to administrator after registration.

I have checked your site today and see that it disappear now. Please check your site again. I think you need to clear cache from your site.
See the screenshot:
Ask question form: http://prntscr.com/av9lh7
Answer question form: http://prntscr.com/av9lun

So now it works on this page http://egallop.com/ask/ushuaia-argentina/ but not on this page http://egallop.com/question/

So as you can see in this page http://egallop.com/question/, I wanted to hide the line: B I Link B-QUOTE DEL

Could you check for me on the CSS?

If you want to remove the the line: B I Link B-QUOTE DEL, you can use the following code:

div#qt_question-content_toolbar {
display: none;
}

Hope this helps!