script.js

function newimage(keyword){
  if(!ACCESS_KEY){
    alert("Please update your access key");
    return;
  }
  var url = `https://api.unsplash.com/search/photos?query=${keyword}&per_page=20&orientation=landscape&client_id=${ACCESS_KEY}`;
  $.get(url,function(data){
    var picture_url = data.results[0].urls.raw;
    setCookie("picture",picture_url);
    $('body').css('background-image',`url(${picture_url})`);
  });
}