06.复杂的背景图片

.box{
    width: 200px;
    height: 200px;
    background: #58a;
background-image:
 linear-gradient(white 2px, transparent 0),
 linear-gradient(90deg, white 2px, transparent 0),
 linear-gradient(hsla(0,0%,100%,.3) 1px,
 transparent 0),
 linear-gradient(90deg, hsla(0,0%,100%,.3) 1px,
 transparent 0);
background-size: 75px 75px, 75px 75px,
 15px 15px, 15px 15px;
    }