Centering CSS transform:scale on grouped objects [duplicate] - html

Question

I'm having issues with the transform-origin while attempting to scale sub-elements.
While attempting to scale animate a box within a larger svg, it uses the transform origin (0,0) from the overall svg, rather than the center of the element I am trying to scale.
This makes it appear like it is "flying in from the top left" which is not what I am looking for. I am looking to make it scale from the elements center.
How do I get the transform-origin to be set relative to the specific element I am animating, without having to hardcode the (x,y) position of the sub-element itself.
Here is a simple example of the issue I'm dealing
#keyframes scaleBox {
from {transform: scale(0);}
to {transform: scale(1);}
}
#animated-box {
animation: scaleBox 2s infinite;
}
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" style="
width: 195px;
"><defs>
<style>.cls-1{fill:#7f7777;}.cls-2{fill:#fff;}</style>
</defs>
<rect class="cls-1" x="0.5" y="0.5" width="99" height="99"></rect>
<path d="M99,1V99H1V1H99m1-1H0V100H100V0Z"></path>
<rect id="animated-box" class="cls-2" x="10.5" y="8.5" width="22" height="6"></rect></svg>

Answer 1

You need transform-box: fill-box;
#keyframes scaleBox {
from {transform: scale(0);}
to {transform: scale(1);}
}
#animated-box {
transform-box: fill-box;
animation: scaleBox 2s infinite;
}
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" style="
width: 195px;
"><defs>
<style>.cls-1{fill:#7f7777;}.cls-2{fill:#fff;}</style>
</defs>
<rect class="cls-1" x="0.5" y="0.5" width="99" height="99"></rect>
<path d="M99,1V99H1V1H99m1-1H0V100H100V0Z"></path>
<rect id="animated-box" class="cls-2" x="10.5" y="8.5" width="22" height="6"></rect></svg>