.color-bg:before{--size:0;background:radial-gradient(circle closest-side,#e5ffb3,transparent);content:"";height:var(--size);left:var(--x);position:absolute;top:var(--y);transform:translate(-50%,-50%);transition:width .2s ease,height .2s ease;width:var(--size)}.color-bg:hover:before{--size:200px}