• The background  Property: https://developer.mozilla.org/en-US/docs/Web/CSS/background
• Styling Images: https://www.w3schools.com/css/css3_images.asp
• Filters: https://developer.mozilla.org/en-US/docs/Web/CSS/filter
• Styling SVG: https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/SVG_and_CSS