Remove Zigzag lines in sidebar

Hi,

I want to remove the zigzag lines on the sidebar and replace them with my own widget separator. I Have the image saved in my media library ready to use.

.widget {
background-image: url(“IMAGE URL HERE”);
}

I used the above Css code and added my file URL for the image but it doesn’t appear to be working.
What am I doing wrong!

Thanks

Reema