Refactored layout. Added NavBar component.

components/buttons/ThemeButton.module.css

@@ -0,0 +1,13 @@
+.button {
+  width: 50px;
+  height: 50px;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  cursor: pointer;
+  padding-bottom: 3px;
+}
+
+.button svg {
+  position: absolute;
+}