JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="output"></textarea>

JavaScript

output=$("#output");
for(i=0; i<801;i++){
   color='#'+Math.floor(Math.random()*16777215).toString(16);
    
    css= "#mydiv[terr='T"+i+"']{\n polygon-fill: "+color+";\n}\n";
   output.append(css);
  
}