.test {
    position: absolute;
    left: 50px;
    top: 50px;
    width: 400px;
    height: 100px;
    border-radius: 10px;
    background-image: radial-gradient(circle at center -778px,
        transparent 800px, rgba(255,0,0,0.4) 800px),
        radial-gradient(circle at center 828px,
        transparent 800px, rgba(255,0,0,0.4) 800px);
    background-position: center top, center bottom;
    background-size: 100% 50%, 100% 50%;
    background-repeat: no-repeat;
}