body {
background: linear-gradient(270deg, #0823ff, #08e7ff, #ffef08, #ff0808);
background-size: 800% 800%;

-webkit-animation: Background 23s ease infinite;
-moz-animation: Background 23s ease infinite;
-o-animation: Background 23s ease infinite;
animation: Background 23s ease infinite;
}

@-webkit-keyframes Background {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@-moz-keyframes Background {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@-o-keyframes Background {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@keyframes Background { 
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}