Scale SVG to fill 90% of available space (while maintaining aspect ratio) - css

Question

I have a <div id="Frame"> element, within it is a <svg> element. I would like the <svg> element to be centered in the frame, and grow at a aspect ratio of 1/1, until one edge uses up say 90% of the available space (so it almost fills the whole space, but has a bit of a border).
But I can't get the SVG to grow. I read the many other similar SO answers, some say CSS overrides the width/height attributes of the SVG, but I tried removing them just incase (not ideal), but it still did not grow). The other common soluation is width: 100%; height: auto;, which did not work for me.
main {
padding: 0; margin: 0;
width: 100vw;
height: 100vh;
}
#FRAME {
padding: 0; margin: 0;
display: flex;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
background-color: lightyellow;
position:relative;
}
#FRAME svg {
max-width: 90%;
max-height: 90%;
width: 90%;
height: auto;
aspect-ratio: 1/1;
flex-grow: 1;
}
<main>
<div id="FRAME">
<svg xmlns="http://www.w3.org/2000/svg" height="24" width="24">
<path d="M0 0h24v24H0z" fill="none"></path>
<path d="M3 5v14a2 2 0 0 0 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2H5a2 2 0 0 0-2 2zm12 4c0 1.66-1.34 3-3 3s-3-1.34-3-3 1.34-3 3-3 3 1.34 3 3zm-9 8c0-2 4-3.1 6-3.1s6 1.1 6 3.1v1H6v-1z"></path>
</svg>
</div>
</main>

Answer 1

You'll need to add a viewBox to the SVG to determine the SVG viewport.
Whilst the width and height attributes help with keeping the aspect ratio, viewBox helps with scaling the SVG contents correctly.
<svg xmlns="http://www.w3.org/2000/svg" height="24" width="24" viewBox="0 0 24 24">
<path d="M0 0h24v24H0z" fill="none"></path>
<path d="M3 5v14a2 2 0 0 0 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2H5a2 2 0 0 0-2 2zm12 4c0 1.66-1.34 3-3 3s-3-1.34-3-3 1.34-3 3-3 3 1.34 3 3zm-9 8c0-2 4-3.1 6-3.1s6 1.1 6 3.1v1H6v-1z"></path>
</svg>