style.css

@import "https://fonts.googleapis.com/css?family=Lato:100";

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html{
    font-size: 10;
    font-family: "Lato", Arial, sans-serif;
}

section{
    width: 100%;
    height: 100vh;
    color: #fff;
    background: linear-gradient(-90deg, #EE7752, #e73c7e, #23a6d2, #23d5ab);
    background-size: 400% 400%;
    position: relative;
    animation: change 10s ease-in-out infinite;
}

h1{
    font-size: 5rem;
    text-transform: 2px;
    text-align: center;
    border: 3px solid #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 5rem 10rem;
}

@keyframes change {
    0%{
        background-position: 0% 50%;
    }
    50%{
        background-position: 100% 50%;
    }
    100%{
        background-position: 0% 50%;
    }  
}

footer {
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100%;
	color: #fff;
	text-align: center;
	padding: 10px;
}