How the order of an item in a flex can be modified?

The order CSS property sets the order to lay out an item in a flex or grid container. Items in a container are sorted by ascending order value and then by their source code order.

/* <integer> values */
order: 5;
order: -5;

/* Global values */
order: inherit;
order: initial;
order: unset;

Accessibility concerns

Using the order property will create a disconnect between the visual presentation of content and DOM order. This will adversely affect users experiencing low vision navigating with the aid of assistive technology such as a screen reader. If the visual (css) order is important, then screen reader users will not have access to the correct reading order.

Source: https://developer.mozilla.org/en-US/docs/Web/CSS/order