How can the nodes' size be maintained while zooming?

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One way to maintain the nodes' size while zooming is to use a vector graphics format such as SVG or PDF for displaying the nodes. These formats allow the nodes' size to be defined in a fixed unit such as points or pixels, which remains constant regardless of the zoom level. Another way is to use CSS to declare the size of the nodes as a percentage of the container's width or height. This method ensures that the size of the nodes remains proportional to the viewport size even when zooming in or out. Additionally, using zoom controls can help maintain the nodes' size by providing users with a way to adjust the zoom level without affecting the size of the nodes.