chatbox with contact form

Hello,
I need a chatbox style contact form on my Enfold website. It needs to be a small button in the bottom corner that expands when clicked on. It also must have a minimise button. like this website: https://www.moveitpro.com/

I can’t find a plugin that does this with a minimise button!!!!!! I figured that i might be able to hand code it so I tried adding my own div to the footer.php file but it doesn’t respond to any CSS that i add to the Enfold custom css box.

I have added the below code to the bottom of my footer.php file (in my child theme). It shows up normally, except i cant add any css. Everything i try doesn’t work.

in footer.php – <div class=”popup-quick-quote”>XXXX</div>

in custom CSS – div.popup-quick-quote { width: 100px; height: 100px; background-color: black; }

Help please