function val(test) {
  
  elem = document.getElementById("button");
  elem2 = document.getElementById("email");
  if (!test.match(/^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i)){
       elem.style.background = "#F76C7A";
       elem2.style.background = "#F76C7A";
  } else {
       elem.style.background = "#B5FF95";
       elem2.style.background = "#B5FF95";
  } 
 
}