Do not add null class to viewport. Update className only if default class name is not set
Do not add null class to viewport. Update className only if default class name is not set

ariutta/svg-pan-zoom,etyplt/svg-pan-zoom,praneybehl/svg-pan-zoom,vsajip/svg-pan-zoom,praneybehl/svg-pan-zoom,lsloss/svg-pan-zoom,etyplt/svg-pan-zoom,ariutta/svg-pan-zoom,lsloss/svg-pan-zoom,Paulyoufu/svg-pan-zoom,vsajip/svg-pan-zoom,ariutta/svg-pan-zoom,Paulyoufu/svg-pan-zoom