SOURCE

body{
background: 
radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.15) 30%, rgba(255,255,255,.3) 32%, rgba(255,255,255,0) 33%) 0 0,
radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.1) 11%, rgba(255,255,255,.3) 13%, rgba(255,255,255,0) 14%) 0 0,
radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.2) 17%, rgba(255,255,255,.43) 19%, rgba(255,255,255,0) 20%) 0 110px,
radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.2) 11%, rgba(255,255,255,.4) 13%, rgba(255,255,255,0) 14%) -130px -170px,
radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.2) 11%, rgba(255,255,255,.4) 13%, rgba(255,255,255,0) 14%) 130px 370px,
radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.1) 11%, rgba(255,255,255,.2) 13%, rgba(255,255,255,0) 14%) 0 0,
linear-gradient(45deg, #343702 0%, #184500 20%, #187546 30%, #006782 40%, #0b1284 50%, #760ea1 60%, #83096e 70%, #840b2a 80%, #b13e12 90%, #e27412 100%);    /* linear-gradient的background-size设置为100%时，45deg不起作用 */
background-size: 470px 470px, 970px 970px, 410px 410px, 610px 610px, 530px 530px, 730px 730px, 100% 100%;
background-color: #840b2a;
}