style tag svg
<svg width="100%" height="100%" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"> <style> /* <![CDATA[ */ circle:hover { fill: orange; stroke: black; stroke-width: 10px; // Note that the value of a pixel depend on the viewBox } /* ]]> */ </style> <circle cx="50" cy="50" r="40" /> </svg>