Getting fixed Sidebar To Stick All The Way to the right

Hello I’m trying to add a fixed sidebar that goes all the way to the furthest right of the screen at all times, even when the screen is smaller. I have attached an example of what I would like to do: http://bradlangan.com/Untitled-1.jpg

Here is my website: http://v2.veenstradental.com/

I have created a fixed sidebar, it is the button “Request Appointment”

I have created a sticky widget using Q2W3 Fixed Widget and made it so my sidebar only shows a custom value. This all worked fine.

I also added the following CSS:

#container .sidebar sidebar right {
position: fixed;
right: 0;
top: 50%;
width: 8em;
margin-top: -2.5em;
transform: translate(-50%);
z-index: 999;
}

I cant seem to get it to go all the way to the right.Thank you so much in advance for any help!