What do you mean by “this”? If you’re referring to the SVG, then I’d suggest setting the width and height to the correct dimensions would be a good start.
You have a class on that SVG. Did you try adding it to the rules for that class?
In fact, using box-sizing: border-box; is now (kind of) considered a best practice. It is even recommended to use it universally in a style sheet, so the box sizing applies to all elements on a page:
I usually do not set the width and height of the SVG, instead set the viewbox dimensions to the maximum width and height of the containg SVG elemets. This makes the SVG container responsive within its parent container.