body {
	background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
	background-size: 400% 400%;
	animation: gradient 15s ease infinite;
	height: 100vh;
    font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;
    font-weight:normal;
    color: #fff;
    text-shadow: 0px 0px 3px rgba(0,0,0,0.5);
}
@keyframes gradient {
	0% {
		background-position: 0% 50%;
	}
	50% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0% 50%;
	}
}
a, a:visited {
    color: #fff;
}
h1 {
    font-size: 50px;
    line-height: 70px;
    text-align: center;
    border-bottom: 1px solid #fff;
    margin: 0;
}
.container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.container div {
    width: 512px;
    height: 512px;
    border: 1px solid #fff;
    padding: 10px;
}
.container div.s2 {
    background: url(../images/s2-512.png) 0 0 no-repeat;
}
footer {
    
    text-align: center;
}

@media(max-width:480px) {
    .container div.s2 {
        width: 256px;
        height: 256px;
        background: url(../images/s2-512.png) 0 0 no-repeat;
        background-size: 256px;
    }
}