SVG:
<rect x="0" y="0" width="6400" height="2400" style="fill:url(#_Linear1);"/>
<defs>
<linearGradient id="_Linear1" x1="0" y1="0" x2="1" y2="0" gradientUnits="userSpaceOnUse" gradientTransform="matrix(2.93759e-13,-2398.72,4797.44,1.46879e-13,3123.83,2397.6)">
<stop offset="0" style="stop-color:rgb(${background_bottom_color});stop-opacity:1"/>
<stop offset="1" style="stop-color:rgb(${background_color});stop-opacity:1"/>
</linearGradient>
</defs>