:root{
--first-color: #FF0000;
--second-color:#00FF00;
--size: 100px;
--speed: 4s;
}
selector{
overflow: hidden !important;
display: flex;
justify-content: center;
align-items: center;
}
selector:before{
content: '';
position: absolute;
width: var(--size);
height: 140%;
background: linear-gradient(var(--first-color), var(--second-color));
animation: animate var(--speed) linear infinite;
}
@keyframes animate{
0%{
transform: rotate(0deg);
}
100%{
transform: rotate(360deg);
}
}