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assets/styles/scss/brain/_layout.scss

@@ -0,0 +1,33 @@
+#brain-wrapper {
+    header {
+        .level-1 {
+            display: flex;
+            justify-content: center;
+            align-items: flex-start;
+
+            position: relative;
+            
+            list-style-type: none;
+
+            &--item {
+                padding: 1rem 2rem;
+            }
+            
+            .level-2 {
+                display: none;
+                margin: 0;
+                padding: 0;
+
+                &.open {
+                    display: block;
+                    position: absolute;
+
+                }
+
+                &--item {
+                    padding: 1rem 0;
+                }
+            }
+        }
+    }
+}