Harlowe: How do I fix an image in my sidebar?

I want to fix an image in my sidebar to appear on every page/passage throughout the story. How do I do this?

Here is my code so far.

tw-sidebar {
    padding-left: 145px !important;
    padding-top: 150px;
    background-image: url(" http://i1172.photobucket.com/albums/r569/ordinarytavern/Ordinary Tavern/signboard1_zpsi2215njk.png");
    background-position: left;
    background-repeat: no-repeat;
}

I have two tw-icons that follow the image. Instead, I want the image to stay fixed to the top. Am I assigning it to the wrong CSS?

Here is what the url currently looks like:

https://cdn.rawgit.com/TCHilliard/TheOrdinaryTavernProject/gh-pages-03282016/OTP Harlow V3 03.28.2016.html