Fix header z-index

diff --git a/css/style.css b/css/style.css
index 0a34a0246b78bccdf336f23af6a5118b1ba5c8a8..917e5e8974861cf30eb9a176cea51778cfd2ebc5 100644 (file)
--- a/css/style.css
+++ b/css/style.css
@@ -127,6 +127,11 @@ h2, h3, a { color: #00f }
   margin: 0.25em 0;
 }
 
+header { position: relative }
+main {
+  position: relative;
+  z-index: 1
+}
 header h1 {
   font-size: min(7.5rem, 17vw);
   font-weight: 900;