Initial commit (stolen from https://gitlab.utc.fr/jrda-2021/website)

_themes/prologue/assets/css/ie8.css

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+/*
+	Prologue by HTML5 UP
+	html5up.net | @ajlkn
+	Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
+*/
+
+/* Section/Article */
+
+	section > .last-child, section.last-child, article > .last-child, article.last-child {
+		margin-bottom: 0;
+	}
+
+/* Form */
+
+	form input[type="text"],
+	form input[type="email"],
+	form input[type="password"],
+	form select,
+	form textarea {
+		-ms-behavior: url("assets/js/ie/PIE.htc");
+	}
+
+/* Button */
+
+	input[type="button"],
+	input[type="submit"],
+	input[type="reset"],
+	button,
+	.button {
+		-ms-behavior: url("assets/js/ie/PIE.htc");
+	}
+
+/* Header */
+
+	#nav ul li a {
+		color: #888;
+	}
+
+		#nav ul li a.active {
+			background: #1C2022;
+		}
+
+	#headerToggle .toggle {
+		background-color: #888;
+	}
+
+/* Main */
+
+	#main > section.cover {
+		background-position: auto;
+		-ms-behavior: url("assets/js/ie/backgroundsize.min.htc");
+	}

_themes/prologue/assets/css/ie9.css

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+/*
+	Prologue by HTML5 UP
+	html5up.net | @ajlkn
+	Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
+*/
+
+/* Button */
+
+	input[type="button"],
+	input[type="submit"],
+	input[type="reset"],
+	button,
+	.button {
+		background-image: url("images/ie/grad0-15.svg");
+	}

_themes/prologue/assets/css/images/ie/grad0-15.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+	<defs>
+		<linearGradient id="gradient1" x1="0%" y1="0%" x2="0%" y2="100%" spreadMethod="pad">
+			<stop offset="0%" stop-color="rgba(0,0,0,0)" stop-opacity="1"/>
+			<stop offset="100%" stop-color="rgba(0,0,0,0.15)" stop-opacity="1"/>
+		</linearGradient>
+	</defs>
+	<rect x="0" y="0" width="100%" height="100%" style="fill:url(#gradient1);" />
+</svg>

_themes/prologue/assets/css/main.scss

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+---
+# Only the main Sass file needs front matter (the dashes are enough)
+---
+@import "jekyll-theme-prologue";