a11y styles, background gradient for header

css/style.css

@@ -481,6 +481,8 @@ button:visited, .button-primary:visited, .logo:visited {
   background: var(--color-background-content-box);
 }
 
+/* Site header */
+
 .site-header {
   display: flex;
   align-items: center;
@@ -488,11 +490,13 @@ button:visited, .button-primary:visited, .logo:visited {
   position: sticky;
   top: 0;
   z-index: 100;
+  background: linear-gradient(180deg, var(--color-neutral-900) 80%, rgba(115, 115, 115, 0.00) 100%);
+  /* backdrop-filter: blur(6px); */
 }
 
 .site-header .menu-bar {
   width: 900px;
-  padding: var(--spacing-5) var(--spacing-6) 0 var(--spacing-5);
+  padding: var(--spacing-5) var(--spacing-6) var(--spacing-4) var(--spacing-5);
   display: flex;
   align-items: center;
   justify-content: space-between;
@@ -739,14 +743,14 @@ button:visited, .button-primary:visited, .logo:visited {
 }
 
 
-
+/* Maint content */
 
 main, footer {
   max-width: 900px;
   border: none;
   margin-left:auto;
   margin-right:auto;
-  padding: var(--spacing-4) var(--spacing-6);
+  padding: 0 var(--spacing-6) var(--spacing-4) var(--spacing-6);
   display: flex;
   flex-direction: column;
   align-items: center;
@@ -886,6 +890,8 @@ footer a:visited {
   color: var(--color-neutral-900);
 }
 
+/* Footer */
+
 .footer-content {
   display: flex;
   flex-direction: row;