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 /* BACKGROUND GRADIENTS */
 background: #FEE1A5;
 background: -moz-linear-gradient(top, #FFF, #FEE1A5 50%, #FFB829 51%,
#FEE1A5 95%, #FEE1A5);
 background: -webkit-gradient(linear, left top, left bottom,
color-stop(0, #FFF), color-stop(.5, #FEE1A5), color-stop(.51, #FFB829),
color-stop(.95, #FEE1A5), color-stop(.96, #FEE1A5), to(#FEE1A5));

 /* BORDER RADIUS */
 -moz-border-radius: 18px;
 -webkit-border-radius: 18px;
 border-radius: 18px;

 border-bottom: 1px solid #FFF;
 border-top: 1px solid #FFB829;
 border-left: 1px solid #FEE1A5;
 border-right: 1px solid #FEE1A5;

https://richtabor.com/block-editor-gradients/

https://gist.github.com/richtabor/f4ed19679d3d3c1734d94df790e9c42a#file-add-colors-and-gradients-to-gutenberg-php