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CSS property display determines how an element is displayed on the page. Main values:

block — the element takes up the full width of the container, starts on a new line. Example: <div>, <p>.
inline — the element takes only the necessary width, does not start on a new line. Example: <span>, <a>.
inline-block — combines properties of inline and block: the element is placed inline, but width and height can be set.

Flexbox

Flexbox is a layout model for simplifying the arrangement of elements within a container, especially for responsive interfaces.

How it works:

A container with display: flex becomes a flex container.
Its child elements are flex items, arranged along the main axis (by default — horizontally).

Main container properties:

flex-direction — direction of the main axis (row, column, row-reverse, column-reverse).
justify-content — alignment of items along the main axis (flex-start, center, space-between, etc.).
align-items — alignment along the cross axis (flex-start, center, stretch, etc.).
flex-wrap — wrapping items onto a new line (nowrap, wrap, wrap-reverse).

Main item properties:

flex-grow — how much the item can grow.
flex-shrink — how much the item can shrink.
flex-basis — the base size of the item.

Example:

.container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}
.item {
  flex-grow: 1;
  flex-basis: 100px;
}

This allows for easy creation of flexible and responsive layouts without using float or positioning.

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Flexbox