CSS

#00af8f rgba gradient

#stacked-radial {
    height: 300px;
    background:
        radial-gradient(circle at 50% 0,rgba(175,0,32,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 6.7% 75%,rgba(0,175,143,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 93.3% 75%,rgba(0,119,175,0.5),rgba(0,0,0,0) 70.71%);
}