Merge pull request 'First cut at dark theme' (#287) from i275_User-desiresa-Dark-Theme into main

Reviewed-on: HPR/hpr_generator#287

public_html/css/hpr.css

@@ -349,7 +349,7 @@ article > p,
       2px 4px 4px var(--shadow-cards);
 	transition: 0.3s;
 	flex: 1 0 100%;
-	overflow-x: scroll;
+	overflow: auto;
 	padding-bottom: 1rem;
 }
 .lane > article:hover,
@@ -841,3 +841,39 @@ fieldset > table td input[type="radio"] {
 		max-width: 30%;
 	}
 }
+@media (prefers-color-scheme: dark) {
+	:root {
+		--link-primary: #bbdfe7;
+		--link-header-hover: #b54c08; /* original --link-primary-hover */;
+		--link-primary-hover: var(--link-secondary-hover);
+		--background-primary: #4d4d4d; /* HPR Grey */
+		--text-primary: #dfdfdf /*#fffff7#fafafa#fbfbee #dfdfdf */;
+		--banner-text-primary: #b6b6b6; 
+		--shadow-secondary-color: hsl(0, 0%, 40%);
+		--input-border-primary: var(--shadow-secondary-color);
+		--lane-button-color: #d5e6ea;	
+	}
+	body > header {
+		background-image: url("/images/main-header-background-dark.png");
+		background-color: #22545a;
+	}	
+	img {
+		filter: brightness(0.70);
+	}
+	a.lane-button {
+		background-image: url("/images/lane-button-background-dark.png");
+		color: var(--lane-button-color);
+	}
+	a.lane-button img {
+		filter: none;
+	}
+	.lane > article > header {
+		color: var(--text-secondary);
+	}
+	#title a:hover {
+		color: var(--link-header-hover);
+	}
+	#hosts td:nth-child(-n+2) {
+		color: var(--text-primary);
+	}
+}