display: flex

Flexbox is a layout mode in CSS that is used to arrange and align items within a container. By using the "display: flex" property on a container element, you can create a flexible layout that automatically adjusts to different screen sizes and device orientations.

Once you have set the container to display as a flexbox, you can use a variety of other properties to control the alignment and positioning of the child elements. For example, you can use "justify-content" to align items along the main axis (either horizontally or vertically), or "align-items" to align items along the cross axis (the axis perpendicular to the main axis).

Flexbox is a powerful tool for creating responsive, dynamic layouts that can adapt to different devices and screen sizes. It is widely supported across all modern browsers, making it a popular choice for web developers who want to create flexible and adaptable designs.