This challenge focuses on creating a red cross inside a grid layout using only HTML and CSS. The goal is to position the squares and cross elements correctly to form the desired pattern. The layout is responsive and centered within the browser window.

This CSS challenge creates a simple orrery-like model using HTML and CSS. It features a main container with two blocks, each containing two circles, arranged to resemble an orbital system. The challenge focuses on positioning elements and using absolute positioning, background colors, and border-radius properties to achieve the desired layout.