Put logo after each header with css ::after

My website: www.deijsmannetjes.de
CMS: Joomla 3

On my website I want to have a small image behind each h1-header. WIth the bottom of the image aligned with teh baseline of the header.
I try this with the following code:

h1::after {
   content: url('images/warptheme/iesmenke-ultrasmall.png'); 
}

Nothing happens. The url of the image is correct: if I use the same URL in an article, it shows the right image.

What am I doing wong?

Kind regards,

Hubert

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