fix accessibility issues

Author: remimarcelle

Wireframe/style.css

@@ -21,7 +21,7 @@ As well as useful links to learn more */
 ====== Design Palette ====== */
 :root {
   --paper: oklch(7 0 0);
-  --ink: color-mix(in oklab, var(--color) 5%, black);
+  --ink: color-mix(in oklab, var(--color, #333333) 5%, black);
   --font: 100%/1.5 system-ui;
   --space: clamp(6px, 6px + 2vw, 15px);
   --line: 1px solid;
@@ -56,7 +56,7 @@ header h1 {
 }
 header p {
   font-size: 1.2rem;
-  color: gray;
+  color: #595959;
 }
 
 /* ====== Site Layout ======