very slight updates to the design

(as per yesterday's hub meeting, where the observation came up that
almost no one had yet really noticed that the howto contained anything
else / was updated since last year. Since we don't have a design yet,
this just slightly tweaks the colours to some that occurred in the
announcement blog post)

themes/rc3/css/base.css

@@ -32,23 +32,23 @@
 
 
 :root {
-    --primary-c1: rgba(178, 57, 255, 1);
+    --primary-c1: #f00efa;
     --primary-c2: rgba(104, 0, 231, 1);
-    --primary-c3: rgba(5, 185, 236, 1);
+    --primary-c3: #4ce9f8;
     --primary-c4: rgba(16, 14, 35, 1);
     
     /*shaded versions*/
-    --primary-c1-s1: rgba(103, 2, 149, 1);
-    --primary-c2-s1: rgba(65, 0, 139, 1);
-    --primary-c3-s1: rgba(0, 118, 169, 1);
+    /* --primary-c1-s1: rgba(103, 2, 149, 1); */
+    /* --primary-c2-s1: rgba(65, 0, 139, 1); */
+    /* --primary-c3-s1: rgba(0, 118, 169, 1); */
 
-    --primary-c1-s2: rgba(68, 9, 105, 1);
-    --primary-c2-s2: rgba(42, 0, 94, 1);
-    --primary-c3-s2: rgba(2, 93, 132, 1);
+    /* --primary-c1-s2: rgba(68, 9, 105, 1); */
+    /* --primary-c2-s2: rgba(42, 0, 94, 1); */
+    /* --primary-c3-s2: rgba(2, 93, 132, 1); */
 
-    --primary-c1-s3: rgba(36, 0, 56, 1);
-    --primary-c2-s3: rgba(20, 0, 47, 1);
-    --primary-c3-s3: rgba(0, 42, 58, 1);
+    /* --primary-c1-s3: rgba(36, 0, 56, 1); */
+    /* --primary-c2-s3: rgba(20, 0, 47, 1); */
+    /* --primary-c3-s3: rgba(0, 42, 58, 1); */
 
     --secondary-c1: rgba(253, 41, 79, 1);
     --secondary-c2: rgba(22, 10, 254, 1);
@@ -175,7 +175,7 @@ code.code-large, .rst-content tt.code-large {
 code {
     padding: 2px 5px;
     background: black;
-    border: solid 1px #555;
+    border: solid 1px #8102fd;
     color: white;
     white-space: pre-wrap;
     word-wrap: break-word;