refactor: update layout

src/styles/_custom.scss

@@ -1 +1,33 @@
-// Here you can add other styles
+// Here you can add other styles// Here you can add other styles
+.header > .container-fluid,
+.sidebar-header {
+  min-height: calc(4rem + 1px); // stylelint-disable-line function-disallowed-list
+}
+
+.sidebar-toggler {
+  @include ltr-rtl("margin-left", auto);
+}
+
+.sidebar-narrow,
+.sidebar-narrow-unfoldable:not(:hover) {
+  .sidebar-toggler {
+    @include ltr-rtl("margin-right", auto);
+  }
+}
+
+.header > .container-fluid + .container-fluid {
+  min-height: 3rem;
+}
+
+.header {
+  padding: 0;
+
+  .container-fluid {
+    padding-right: $spacer;
+    padding-left: $spacer;
+  }
+}
+
+.footer {
+  min-height: calc(3rem + 1px); // stylelint-disable-line function-disallowed-list
+}

src/styles/_layout.scss

@@ -1,6 +1,22 @@
+body {
+  background-color: var(--cui-tertiary-bg);
+}
+
 .wrapper {
   width: 100%;
   @include ltr-rtl("padding-left", var(--cui-sidebar-occupy-start, 0));
   will-change: auto;
   @include transition(padding .15s);
 }
+
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    body {
+      background-color: var(--cui-dark-bg-subtle);
+    }
+
+    .footer {
+      --cui-footer-bg: var(--cui-body-bg);
+    }
+  }
+}