A calculator built using ReactJS.
The article is an introduction to a front-end coding challenge called Frontend Mentor - Calculator app. The challenge requires participants to build a calculator app that closely resembles the provided design. Participants need a good understanding of HTML, CSS, and JavaScript to complete the challenge. The users should be able to see the elements adjust based on their device's screen size, perform mathematical operations, and adjust the color theme. There is also a bonus feature of checking the initial theme preference using prefers-color-scheme and saving additional changes in the browser.
The article introduces a front-end coding challenge where participants are required to build a calculator app based on a provided design. The app must have responsive design, support mathematical operations, and allow users to adjust the color theme. Bonus features include checking initial theme preference and saving additional changes in the browser. The installation guide explains the steps to build the app.