Fix github corner.

Source: https://github.com/tholman/github-corners
License MIT

assets/css/style.css

@@ -193,7 +193,7 @@ section-area.warning a { color: #e5f1d3; text-decoration:underline; }
 section {margin-bottom:20px; background:#fff; border-radius:8px; border:1px solid #ddd; padding:10px 20px 20px 20px;}
 .subsection {margin-bottom:20px;}
 .subsection:last-child {margin-bottom:0px;}
-img.github-ribbon {float: right; position: relative; top: 0; right: 0; border: 0;}
+.github-ribbon {float: right; position: relative; top: -10px; right: -20px; border: 0; z-index: 0;}
 
 /* Custom text-selection colors (remove any text shadows: twitter.com/miketaylr/status/12228805301) */
 ::-moz-selection {background: #000; color: #fff; text-shadow: none;}

downloads.html

@@ -293,8 +293,17 @@ <h1>Other Systems</h1>
 			<p>It's possible to build OpenSCAD on other systems as long as a C++ compiler and the prerequisite software libraries are available.</p>
 		</section>
 
-    <a href="https://github.com/openscad/openscad"><img class="github-ribbon" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a>
-		<section id="source-code" class="github-ribbon">
+		<section id="source-code">
+				<div style="position: relative;">
+					<!-- Github Corner: https://github.com/tholman/github-corners (MIT License) -->
+					<a href="https://github.com/openscad/openscad" class="github-ribbon" aria-label="View source on GitHub">
+						<svg width="100" height="100" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true">
+						  <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
+						  <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
+						  <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path>
+						</svg>
+					</a>
+				</div>
 			<h1>Source Code</h1>
 			<div class="download-button">
 				<a id="SRC_RELEASE_URL" href="https://files.openscad.org">