flip header to a simple gray background and /no/ image

themes/gochowdown/assets/scss/_base.scss

@@ -1263,11 +1263,6 @@ input[type=range] {
 img{width:100%;}
 .no-line-height{line-height:0;}
 
-.bg-blue-tile{background: #007FFF url($bg-blue-tile-url); position:relative;}
-@media all and (min-width:40em){
-.bg-blue-tile:after{position:absolute; top:0; left:0; right:0; bottom:0; content:" "; box-shadow:inset 0 0 100px 20px #007FFF; z-index:1; pointer-events:none;}
-}
-
 .max-width-4{max-width:64em}
 .max-width-3{max-width:52em}
 .max-width-2{max-width:40em}

themes/gochowdown/assets/scss/_navigation.scss

@@ -1,6 +1,6 @@
 .navigation {
   width: 100%;
-  background-image: url($bg-blue-tile-url); 
+  background-color: #404040;
   padding: 1rem 0;
   a, span {
     display: inline;

themes/gochowdown/assets/scss/gochowdown.scss

@@ -1,5 +1,4 @@
 {{ $tileurl := "assets/tile.png" | absURL }}
-$bg-blue-tile-url: "{{ $tileurl  }}";
 
 @import "variables";
 @import "base";