give equal width to elements in container div

<div className="flex w-[60%] h-[60%] mt-[5%] rounded-md border-2 border-[#000]">
  <div className="flex flex-col bg-white h-full"></div>
  <div className="flex flex-col bg-white h-full"></div>
  <div className="flex flex-col bg-white h-full"></div>
  <div className="flex flex-col bg-white h-full"></div>
  <div className="flex flex-col bg-white h-full"></div>
  <div className="flex flex-col bg-white h-full"></div>
  <div className="flex flex-col bg-white h-full"></div>
</div>