Generate repeating SVG patterns for backgrounds.
background-image: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2230%22%20height%3D%2230%22%3E%3Crect%20width%3D%2230%22%20height%3D%2230%22%20fill%3D%22%23ffffff%22%2F%3E%3Ccircle%20cx%3D%2215%22%20cy%3D%2215%22%20r%3D%224.5%22%20fill%3D%22%23000000%22%2F%3E%3C%2Fsvg%3E");
background-repeat: repeat;
background-size: 30px 30px;