Customize Theme

The dashboard template we generated is using Ant Design UI React library for all the UI components. It is one of the most popular React UI kits alongside Material UI. It uses Less as a stylesheet language and allows us to customize the design by overriding default Less variables.

As I mentioned in the first chapter, our Dashboard App is based on Create React App (CRA). Currently, it doesn’t support Less out of the box, and to make it work, we need to use an eject command.

Create React App provides a fully configured environment and a default configuration. And all this configuration is hidden from you. But when you eject, all that configuration will be exposed to you. It means that you will get full control and will be able to add things like Less support. But at the same time, you will be responsible for maintaining all of that configuration.

eject is irreversible. You need to commit your changes before and then run eject in the dashboard-app folder.

$ git add -A
$ git commit -m "Initial"
$ yarn eject

Once you’ve run it, you can find a new folder called config. Inside the config folder, you can find all the project configuration files, but today we only need the webpack.config.js file.

Now let’s install Less.

$ yarn add less less-loader

Next, we need to modify the webpack configuration file. Open config/webpack.config.js and Find the cssRegex constant and change it:

-const cssRegex = /\.css$/;
+const cssRegex = /\.(?:le|c)ss$/;

Then, find the getStyleLoaders function. On the loaders array, after the css-loader, add the LESS loader. Make sure your code looks like this:

// common function to get style loaders
const getStyleLoaders = (cssOptions, preProcessor) => {
    const loaders = [

      // ...

        loader: require.resolve('css-loader'),
        options: cssOptions,
        loader: require.resolve('less-loader'),
        options: {
          lessOptions: {
            javascriptEnabled: true,

      // ...

That’s it! With this in place, we are ready to override some of the antd’s default variables and styles. We are going to customize some variables according to the antd’s Customize Theme guide. Create a dashboard-app/src/variables.less file with the following content.

// Colors
@dark-blue: #43436B;
@primary-color: @blue-6;

// Base Scaffolding Variables
@font-family: 'DM Sans', sans-serif;
@font-size-base: 16px;
@body-background: #EEEEF5;
@heading-color: @dark-blue;
@text-color: #878F9F;

// Layout
@layout-header-background: @dark-blue;
@layout-body-background: #EEEEF5;
@layout-header-height: 48px;

// Buttons
@btn-primary-bg: #FF6492;
@btn-height-base: 40px;

@btn-disable-color: white;
@btn-disable-bg: #FF6492;
@btn-disable-border: #FF6492;

@btn-default-color: @dark-blue;
@btn-default-border: #D0D0DA;

// Input
@input-color: @dark-blue;
@input-height-base: 40px;

// Select
@select-border-color: #ECECF0;

// Modal
@modal-body-padding: 32px;

// Typography
@typography-title-font-weight: bold;

Next, let’s create a index.less file, which will be imported in index.js. Here, we do several things: import antd styles, import the Dm Sans font from Google Fonts, import the just-created file with modified variables, and finally, add some minor customization.

@import '~antd/dist/antd.less';
@import url('');
@import 'variables.less';

.ant-btn-primary[disabled] {
  opacity: 0.4;

.ant-modal-header {
  border-bottom: none;
  padding: 40px 32px 0 32px;

.ant-modal-footer {
  border-top: none;
  padding: 0 32px 40px 32px;
  text-align: left;

.ant-select {
  color: @dark-blue;

.ant-select-dropdown-menu-item {
  color: @dark-blue;

The last thing is to import index.less in our index.js. Add this import to the file

  // ...

  import App from './App';
+ import "./index.less";

  // ...

The styles above customize our design globally, changing the look of some components. But to customize some specific components, like the top menu, we are going to use Styled Components.

Styled Components allows you to write CSS right inside your components. It is a variant of “CSS-in-JS”—which solves many of the problems with traditional CSS like selector name collisions.

Let’s first add styled-components to our project.

$ yarn add styled-components

The first component to style with Styled Components is going to be the <Header />. Let’s first download a logo in SVG. We are using the Cube.js logo here as an example, but you can place your product’s logo the same way.

$ cd dashboard-app/src/components && curl > logo.svg

Next, replace the content of the src/components/Header.js with the following.

import React from "react";
import { SignOut } from "aws-amplify-react";
import { Layout, Menu } from "antd";
import { Link } from "react-router-dom";
import styled from 'styled-components';
import logo from './logo.svg';

const StyledHeader = styled(Layout.Header)`
  padding: 0 28px

const StyledMenu = styled(Menu)`
  background: transparent;
  line-height: 41px;

const MenuItemStyled = styled(Menu.Item)`
  && {
    top: 4px;
    border-bottom: 4px solid transparent;

    &:hover {
      border-bottom: 4px solid transparent;
      & > a {
        color: #ffffff;
        opacity: 1;
    color: white;
    border-bottom: 4px solid white;

    & > a {
      opacity: 1;
  && > a {
    color: #ffffff;
    opacity: 0.60;
    font-weight: bold;
    letter-spacing: 0.01em;

const Logo = styled.div`
  float: left;
  margin-right 40px;

const signOutStyles = {
  navButton: {
    color: "white",
    background: "none",
    textTransform: "none",
    fontSize: "13px",
    fontWeight: "bold",
    minWidth: 0

const Header = ({ location }) => (
  <StyledHeader >
      <img src={logo} />
      <MenuItemStyled key="/explore">
        <Link to="/explore">Explore</Link>
      <MenuItemStyled key="/">
        <Link to="/">Dashboard</Link>
      <MenuItemStyled style={{ float: "right", paddingRight: 0 }} key="sign-out">
        <SignOut theme={signOutStyles} />

export default Header;

Yay! We’ve finished another chapter. We have customized global antd variables and updated the design of our navigation bar. Restart the Dashboard App server and test the changes at http://localhost:3000.

In the next chapter, we are going to customize the layout of the Explore page.