SVG:
<path d="M1280,720L1280,0L0,0L0,720L1280,720Z" style="fill:url(#_Linear1);"/>
<defs>
<linearGradient id="_Linear1" x1="0" y1="0" x2="1" y2="0" gradientUnits="userSpaceOnUse" gradientTransform="matrix(4.40873e-14,720,-1280,7.83774e-14,640,1.31672e-13)">
<stop offset="0" style="stop-color:rgb(${background_color});stop-opacity:1"/>
<stop offset="1" style="stop-color:rgb(${background_bottom_color});stop-opacity:1"/>
</linearGradient>
</defs>