add nav-list class for series of buttons and update App

src/assets/scss/app.scss

@@ -4,5 +4,7 @@
 
 @import 'base/root';
 
+@import 'classes/nav-list';
+
 @import 'fonts/noto-sans';
 @import 'fonts/redaction';

src/assets/scss/classes/_nav-list.scss

@@ -0,0 +1,27 @@
+.nav-list {
+  font-family: $font-family-base;
+
+  ul {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    height: 45px;
+    padding: 0;
+    margin: 0;
+  }
+
+  li {
+    list-style: none;
+    line-height: 0;
+
+    &:not(:last-child) {
+      margin-right: 20px;
+    }
+  }
+
+  &.dot-btns {
+    li:not(:last-child) {
+      margin-right: 20px;
+    }
+  }
+}