Introduction to Flexbox

Flexbox is a CSS3 layout mode for arranging elements in one dimension. It simplifies aligning and distributing space among items in a container, even when their size is unknown or dynamic.

To use flex properties, first declare a container with 'display: flex;'. This creates a flex context for all its children (flex items), enabling use of the flex alignment and distribution properties.

The 'justify-content' property aligns flex items along the main axis. Options include flex-start, flex-end, center, space-between, space-around, and space-evenly, allowing for versatile horizontal control.

The 'align-items' property aligns items on the cross axis. It's useful for vertical alignment with options like stretch, center, flex-start, flex-end, and baseline.

'align-self' overrides container's align-items value for individual flex items. This property provides precise control over each item's alignment on the cross axis.

When flex items wrap across multiple lines, 'align-content' determines the spacing and alignment. Similar to justify-content, but for the cross axis and only works on multi-line flex containers.

Did you know using 'margin: auto;' on flex items can absorb extra space, effectively aligning items? Also, setting min-width or min-height to 'auto' on a flex item aligns content based on its size.