function hide_show() { var y = document.getElementById("boton_hide") var x = document.getElementById("slider_principal"); if (x.style.display === "none") { y.style.margin = "0px 0px 0px 0px"; } else { y.style.margin = "80px 0px 0px 0px"; } if (x.style.display === "none") { x.style.display = "block"; x.style.transitionTimingFunction = "none"; } else { x.style.display = "none"; x.style.transitionTimingFunction = "linear"; } }