CSS keep image in ::before from expanding past the pseudo-element - css

Question

I have a little mark at the bottom right of my own code snippet page, which should also contain my website's favicon. I want to use ::before for this but I have no clue how to resize the image to stay inside the 1em by 1em pseudo-element.
div#snippet {
position: absolute;
top: 0px;
left: 0px;
right: 0px;
bottom: 0px;
background-color: rgba(200,200,200,0.3);
}
a#l2020-link {
color: blue;
background-color: lightgrey;
position: absolute;
bottom: 10px;
right: 10px;
border: 0px solid grey;
border-radius: 3px;
padding: 3px;
display: flex;
flex-direcion: row;
}
a#l2020-link::before {
content: url(https://www.lampe2020.de/favicon.ico);
width: 1em;
height: 1em;
display: inline-block;
}
<div id="snippet">
<!-- Imagine the code inputs and the iFrame to show the result here -->
Lampe2020.de
</div>
I want the favicon to be fully visible but shrunk down to 1em by 1em.
I've tried CSS object-fit but it had absolutely null effect on the image no matter what I set it to. overflow: hidden or overflow: clip kinda work but they obviously just cut off what's too much of the image and don't resize the image to fit.

Answer 1

You can set the content to "" and use background-image instead, and set the background-size to 1em.
div#snippet {
position: absolute;
top: 0px;
left: 0px;
right: 0px;
bottom: 0px;
background-color: rgba(200,200,200,0.3);
}
a#l2020-link {
color: blue;
background-color: lightgrey;
position: absolute;
bottom: 10px;
right: 10px;
border: 0px solid grey;
border-radius: 3px;
padding: 3px;
display: flex;
flex-direcion: row;
}
a#l2020-link::before {
content:"";
background-image: url(https://www.lampe2020.de/favicon.ico);
width: 1em;
height: 1em;
background-size:1em;
display: inline-block;
}
<div id="snippet">
<!-- Imagine the code inputs and the iFrame to show the result here -->
Lampe2020.de
</div>