export default function () {
  const now = new Date();

  if (
    now.getFullYear() === 2020 &&
    now.getMonth() === 3 &&
    now.getDate() === 4
  ) {
    const filter = `
    html{
      filter: grayscale(100%);
      -webkit-filter: grayscale(100%);
      -moz-filter: grayscale(100%);
    }
  `;
    document.head.insertAdjacentHTML('beforeend', `<style>${filter}</style>`);
  }
}