<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32"><g fill="none"><path fill="#9B9B9B" d="M4.028 1.5a2.5 2.5 0 0 0-2.5 2.5v24a2.5 2.5 0 0 0 2.5 2.5h24a2.5 2.5 0 0 0 2.5-2.5V4a2.5 2.5 0 0 0-2.5-2.5z"/><path fill="#fff" d="M2.528 4a1.5 1.5 0 0 1 1.5-1.5h24a1.5 1.5 0 0 1 1.5 1.5v24a1.5 1.5 0 0 1-1.5 1.5h-24a1.5 1.5 0 0 1-1.5-1.5z"/></g></svg>
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This is a multicolor icon, so its colors are fixed. You can still adjust size, background, rotation, and animation.
