let targetWidth = 240;
let scale = targetWidth / 200;

let gdt = document.getElementById('gdt');
gdt.style.maxWidth = `${targetWidth*6+20}px`;
gdt.style.gridTemplateColumns = `repeat(auto-fill,minmax(${targetWidth}px,1fr))`;
gdt.style.gap = '1px';
gdt.style.padding = '1px';

for(let link of gdt.getElementsByTagName('a')){
  let img = link.firstChild;
  link.style.width = `${img.offsetWidth * scale}px`;
  link.style.height = `${img.offsetHeight * scale}px`;
  img.style.transformOrigin = 'top left';
  img.style.transform = `scale(${scale})`;
};