You can download the pattern or use the CSS3 code below (you can copy the text).
body {
/* CSS3 pattern provided by JonesPatterns.com */
background-image:
linear-gradient(45deg,transparent calc(50% - .8px),#283618 50%,transparent calc(50% + .8px),transparent 100%),
linear-gradient(-45deg,transparent calc(50% - .8px),#283618 50%,transparent calc(50% + .8px),transparent 100%),
conic-gradient(from -135deg at 49.5% 100%, #f6d4ba 90deg, transparent 0 100%),
conic-gradient(from 45deg at 49.5% 100%, #f6d4ba 90deg, transparent 0 100%),
conic-gradient(from -45deg at 100% 49.5%, #f6d4ba 90deg, transparent 0 100%),
conic-gradient(from -45deg at 0% 49.5%, #f6d4ba 90deg, transparent 0 100%);
background-color: #d1495b;
background-size: 120px 120px;
}