[JavaScript] Show Content If Pass Quiz

<div>13 + 51 = ?</div>
Input answer and press enter: <input id="ans" type="text"><br><br>
<div id="info"></div>

var ans = document.getElementById("ans");
var info = document.getElementById("info");
ans.addEventListener("keydown", function(e) {
  if (e.key == "Enter") {
    if (e.target.value.trim() == "64") {
      // correct answer, show youtube video
      info.innerHTML = '<div style="position:relative;height:0;padding-bottom:75.0%"><iframe src="https://www.youtube.com/embed/UOTKWp-5bKI?ecver=2" width="480" height="360" frameborder="0" style="position:absolute;width:100%;height:100%;left:0" allowfullscreen></iframe></div>';
    } else {
      info.innerHTML = "wrong answer!";
    }
  }
});