On the template
<div id='div-gpt-ad-1538471082052-0' class='wide-ad'>
<script>
googletag.cmd.push(function() { googletag.display('div-gpt-ad-1538471082052-0'); });
</script>
</div>
On .js file
googletag.cmd.push(function() {
//staging mapping leaderboard
var mappingBigleaderboard_home = googletag.sizeMapping().
addSize([768, 0], [728, 250]). //desktop
addSize([500, 0], [425, 146]). //phone
addSize([0, 0], [320, 110]). //phone
build();
//staging big leaderboard
window.BigStagingLeaderboardHomeSlot = googletag.defineSlot('/181891612/Staging_BigLeaderboard_Home', [[728, 250], [320, 110]], 'div-gpt-ad-1538471082052-0').defineSizeMapping(mappingBigleaderboard_home).addService(googletag.pubads());
googletag.pubads().enableSingleRequest();
googletag.pubads().enableSyncRendering();
googletag.pubads().collapseEmptyDivs();
googletag.enableServices();
});