body {
	margin: 1em 0 0 0;
	padding: 0;
    font-family: sans-serif;
	background: linear-gradient(45deg,#4e2947,#006f80);
	background-size: 200% 200%;
    position: relative;
	
	-webkit-animation: BGSMS 3s ease infinite;
	-moz-animation: BGSMS 3s ease infinite;
	animation: BGSMS 3s ease infinite;
}
@-webkit-keyframes BGSMS {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@-moz-keyframes BGSMS {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@keyframes BGSMS {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}

img {
    position: absolute;
    width: 40vw;
    left: 50%;
    margin-top: 50vh;
    transform: translate(-50%, -50%);
}