Add button Replay Youtube

window.addEventListener("load", function(event) {
    var videoElm = $("#movie_player").find('video')[0];
    addButtonReplay(videoElm);
    $(videoElm).on('play', function(e) {
        addButtonReplay(videoElm);
    });
});

function addButtonReplay(videoElm) {
  var buttonReplay = $('<button type="button" style="background-color: #4285F4;color: white;height:24px;padding: 0 5px;border-radius:4px;cursor:pointer;outline:none;">Replay</button>');
  $("#watch7-subscription-container .yt-uix-button-subscription-container").prepend(buttonReplay);
  buttonReplay.click(function() {
    if ($(videoElm).attr('loop')) {
      $(videoElm).removeAttr('loop');
      $(buttonReplay).css({ 'background-color': '#4285F4' });
    } else {
      $(videoElm).attr('loop', true);
      $(buttonReplay).css({ 'background-color': '#0b51c5' });
    }
  });
}