.gradients-anim {
position:absolute;
top:0;
left:0;
width:100%;
height:100vh;
background:linear-gradient(-45deg,#ee7752,#e73c7e,#23a6d5,#23d5ab);
background-size:400% 400%;
animation:gradientBG 15s ease infinite
}

@keyframes gradientBG {
0% {
background-position:0 50%
}

50% {
background-position:100% 50%
}

100% {
background-position:0 50%
}
}