Adjusting size of SVG image added via code block

Hey ! I have a client that has a few icons on their website and they have requested I used SVG files instead of PNG to improve clarity. I've figured out how to add SVG files to Squarespace using code blocks, but now I'm stumped on how to control the width of the icons using CSS.

I've tried targeting the unique code blocks but that hasn't seemed to work. For example:

#block-yui_3_17_2_1_1617983377975_9584 {

max-width: 10%;

margin: 0 auto;

}

I've also tried adding a class to the code block:

<img src="/s/SEEDCOWORK_LOGO_HORIZONTAL_SOLID_WHITE__.svg" alt="Seed Coworking + Flexible Office Space" class="footer-logo-svg">

And then targeting the class:

.footer-logo-svg {

max-width: 10%;

margin: 0 auto;

}

But still no luck. Any suggestions?