var Header = document.querySelector('.atmc-header'); var body_wrp = document.querySelector('.body-wrapper'); if(Header){ function getElHeight(){ const elementHeight = Header.offsetHeight; var unit = "px" body_wrp.style.paddingTop = elementHeight + unit; console.log(elementHeight) } getElHeight(); window.addEventListener("scroll", getElHeight); window.addEventListener("load", getElHeight); window.addEventListener("resize",getElHeight); }