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background-attachment

A background-image that will not scroll with the page (fixed):

Example 1: a SVG background

background-color: #ee5522;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2000 1500'%3E%3Cdefs%3E%3CradialGradient id='a' gradientUnits='objectBoundingBox'%3E%3Cstop offset='0' stop-color='%23FB3'/%3E%3Cstop offset='1' stop-color='%23ee5522'/%3E%3C/radialGradient%3E%3ClinearGradient id='b' gradientUnits='userSpaceOnUse' x1='0' y1='750' x2='1550' y2='750'%3E%3Cstop offset='0' stop-color='%23f7882b'/%3E%3Cstop offset='1' stop-color='%23ee5522'/%3E%3C/linearGradient%3E%3Cpath id='s' fill='url(%23b)' d='M1549.2 51.6c-5.4 99.1-20.2 197.6-44.2 293.6c-24.1 96-57.4 189.4-99.3 278.6c-41.9 89.2-92.4 174.1-150.3 253.3c-58 79.2-123.4 152.6-195.1 219c-71.7 66.4-149.6 125.8-232.2 177.2c-82.7 51.4-170.1 94.7-260.7 129.1c-90.6 34.4-184.4 60-279.5 76.3C192.6 1495 96.1 1502 0 1500c96.1-2.1 191.8-13.3 285.4-33.6c93.6-20.2 185-49.5 272.5-87.2c87.6-37.7 171.3-83.8 249.6-137.3c78.4-53.5 151.5-114.5 217.9-181.7c66.5-67.2 126.4-140.7 178.6-218.9c52.3-78.3 96.9-161.4 133-247.9c36.1-86.5 63.8-176.2 82.6-267.6c18.8-91.4 28.6-184.4 29.6-277.4c0.3-27.6 23.2-48.7 50.8-48.4s49.5 21.8 49.2 49.5c0 0.7 0 1.3-0.1 2L1549.2 51.6z'/%3E%3Cg id='g'%3E%3Cuse href='%23s' transform='scale(0.12) rotate(60)'/%3E%3Cuse href='%23s' transform='scale(0.2) rotate(10)'/%3E%3Cuse href='%23s' transform='scale(0.25) rotate(40)'/%3E%3Cuse href='%23s' transform='scale(0.3) rotate(-20)'/%3E%3Cuse href='%23s' transform='scale(0.4) rotate(-30)'/%3E%3Cuse href='%23s' transform='scale(0.5) rotate(20)'/%3E%3Cuse href='%23s' transform='scale(0.6) rotate(60)'/%3E%3Cuse href='%23s' transform='scale(0.7) rotate(10)'/%3E%3Cuse href='%23s' transform='scale(0.835) rotate(-40)'/%3E%3Cuse href='%23s' transform='scale(0.9) rotate(40)'/%3E%3Cuse href='%23s' transform='scale(1.05) rotate(25)'/%3E%3Cuse href='%23s' transform='scale(1.2) rotate(8)'/%3E%3Cuse href='%23s' transform='scale(1.333) rotate(-60)'/%3E%3Cuse href='%23s' transform='scale(1.45) rotate(-30)'/%3E%3Cuse href='%23s' transform='scale(1.6) rotate(10)'/%3E%3C/g%3E%3C/defs%3E%3Cg transform='rotate(0 0 0)'%3E%3Cg transform='rotate(0 0 0)'%3E%3Ccircle fill='url(%23a)' r='3000'/%3E%3Cg opacity='0.5'%3E%3Ccircle fill='url(%23a)' r='2000'/%3E%3Ccircle fill='url(%23a)' r='1800'/%3E%3Ccircle fill='url(%23a)' r='1700'/%3E%3Ccircle fill='url(%23a)' r='1651'/%3E%3Ccircle fill='url(%23a)' r='1450'/%3E%3Ccircle fill='url(%23a)' r='1250'/%3E%3Ccircle fill='url(%23a)' r='1175'/%3E%3Ccircle fill='url(%23a)' r='900'/%3E%3Ccircle fill='url(%23a)' r='750'/%3E%3Ccircle fill='url(%23a)' r='500'/%3E%3Ccircle fill='url(%23a)' r='380'/%3E%3Ccircle fill='url(%23a)' r='250'/%3E%3C/g%3E%3Cg transform='rotate(0 0 0)'%3E%3Cuse href='%23g' transform='rotate(10)'/%3E%3Cuse href='%23g' transform='rotate(120)'/%3E%3Cuse href='%23g' transform='rotate(240)'/%3E%3C/g%3E%3Ccircle fill-opacity='0.1' fill='url(%23a)' r='3000'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    background-attachment: fixed;
    background-size: cover;

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