script.js

var css = document.querySelector("h3");
var color1 = document.querySelector(".color1");
var color2 = document.querySelector(".color2");
var body = document.getElementById("gradient");
var randomButton = document.getElementById("Random");

function setGradient() {
	body.style.background = 
	"linear-gradient(to right, " 
	+ color1.value 
	+ ", " 
	+ color2.value 
	+ ")";

	css.textContent = body.style.background + ";";
}

function getRandomColor(){
	var letters = '0123456789ABCDEF';
	var color = '#';
	for (var i =0; i<6; i++) {
		color += letters[Math.floor(Math.random() * 16)];
	}
	return color;
}

function randomColors(){
	color1.value = getRandomColor();
	color2.value = getRandomColor();

	setGradient();
}

color1.addEventListener("input", setGradient);

color2.addEventListener("input", setGradient);

randomButton.addEventListener("click", randomColors);