how to change sidebar color?

Hi everyone,

I hope someone can help me to change my sidebar color at my site https://www.practicaryoga.com. I’ve been checking previous posts about this and what I understand is that I have to change the information on my style.css sheet.

So I changed this:
#sidebar-primary {
float: right;
width: 27.65957446808511%;
}

into this:

#sidebar-primary {
float: right;
width: 27.65957446808511%;
background-image: https://www.practicaryoga.com/wp-content/uploads/2012/09/backcolor.jpg;
background-repeat: repeat;
}

My background image is the color I want. But it’s not working. I guess I’m doing something wrong. Suggestions please!

Thanks,

Sharon