yet another redesign

resources/app/stylesheets/app.less

@@ -13,7 +13,7 @@
 
 body {
     font-family: sans-serif;
-    margin: 0 3%;
+    margin: 0;
     padding: 0;
     background-color: @body-background-color;
 }
@@ -56,12 +56,6 @@ img, svg {
     border: @border-stack;
 }
 
-.accent-border-element {
-    border-left: @accent-border;
-    margin: @element-margin;
-    padding: 1rem;
-}
-
 .__icon {
     color: @ci-blue;
     font-weight: bold;
@@ -73,14 +67,17 @@ img, svg {
     grid-template-areas: "header header" "nav main" "footer footer";
     margin: auto;
 
+    header, footer, main, nav, aside {
+        padding: @text-padding-v @text-padding-h;
+    }
+
     header {
         grid-area: header;
         display: grid;
         grid-template-columns: 40% 60%;
         align-items: center;
-        .accent-border-element;
-        border-bottom: 1px solid @ci-color;
         margin-top: 0;
+        background-color: Window;
 
         .app-title {
             grid-column: 1;
@@ -106,7 +103,8 @@ img, svg {
 
     nav {
         grid-area: nav;
-        .accent-border-element;
+        background-color: ThreeDShadow;
+        padding-right: 0;
 
         h2::before {
             content: "▤ ";
@@ -126,7 +124,6 @@ img, svg {
 
     main {
         grid-area: main;
-        .accent-border-element;
         border: none;
 
         .schema-title__name {
@@ -154,17 +151,10 @@ img, svg {
 
     aside {
         grid-area: sidebar;
-        .accent-border-element;
     }
 
     footer {
         grid-area: footer;
-        .accent-border-element;
-        border-top: 1px solid @ci-color;
-    }
-
-    header, footer, main, nav, aside {
-        padding: @text-padding-v @text-padding-h;
     }
 }