You can basically download SVG or just copy CSS code to use the background patterns from these websites.⁠

• https://www.heropatterns.com/

• https://www.svgbackgrounds.com/

• https://pattern.monster/

• https://bgjar.com/

• https://patternpad.com/

• https://www.visiwig.com/patterns/

• https://gradienta.io/