javascript: (function () {
  document.body.innerHTML += `<style>* {
    background:% 20#000 % 20!important;
    color:% 20#0f0 % 20!important;
    outline:% 20solid % 20#f00 % 201px % 20!important;
  } </style > `;
})();

bookmarklet = 'javascript:'
    + encodeURIComponent('(function () {' + code + '}())')
    + ';';