function hideDecoration(){document.getElementById('title-bar').style.transition="margin-top 0.5s linear 0s";document.getElementById('title-bar').style.marginTop="-30px";document.getElementById('menu').style.transition="margin-top 0.5s linear 0s";document.getElementById('menu').style.marginTop="-30px";}
function showDecoration(){document.getElementById('title-bar').style.transition="margin-top 0.5s linear 0s";document.getElementById('title-bar').style.marginTop="0";document.getElementById('menu').style.transition="margin-top 0.5s linear 0s";document.getElementById('menu').style.marginTop="0";}
