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This complete guide explains everything about CSS flexbox, focusing on all the different possible properties for the
parent element like flex-items, justify-content, flex-directions, flex-wrap, etc.


This defines a flex container; inline or block depending on the given value. It enables a flex context for all its
direct children

.container {
display: flex;



This establishes the main-axis, thus defining the direction flex items are placed in the flex container. Flexbox is
(aside from optional wrapping) a single-direction layout concept. Think of flex items as primarily laying out either
in horizontal rows or vertical columns.

.container {
flex-direction: row | row-reverse | column | column-reverse;
  • row(default): left to right in ltr; right to left in rtl
  • row-reverse: right to left in ltr; left to right in rtl
  • column: same as row but top to bottom
  • column-reverse: same as row-reverse but bottom to top



By default, flex items will all try to fit onto one line. You can change that and allow the items to wrap
as needed with this property.

.container {
flex-wrap: nowrap | wrap | wrap-reverse;
  • nowrap (default): all flex items will be on one line
  • wrap: flex items will wrap onto multiple lines, from top to bottom.
  • wrap-reverse: flex items will wrap onto multiple lines from bottom to top


This is a shorthand for the flex-direction and flex-wrap properties, which together define the flex container’s main and cross axes. The default value is row nowrap.

.container {
flex-flow: column wrap;



This defines the alignment along the main axis. It helps distribute extra free space leftover when either all
the flex items on a line are inflexible, or are flexible but have reached their maximum size. It also exerts
some control over the alignment of items when they overflow the line.

.container {
justify-content: flex-start | flex-end | center | space-between | space-around |


  • flex-start (default):  items are packed toward the start of
  • flex-end: items are packed toward the end of the
  • start: items are packed toward the start of the writing-mode
  • end: items are packed toward the end of the writing-mode
  • left: items are packed toward left edge of the container,
    that doesn’t make sense with the flex-direction, then it behaves like start.
  • right: items are packed toward right edge of the container,
    that doesn’t make sense with the flex-direction, then it behaves like end.
  • center: items are centered along the line
  • space-between: items are evenly distributed in the line; first
    is on the start line, last item on the end line
  • space-around: items are evenly distributed in the line with
    space around them. Note that visually the spaces aren’t equal, since all the items have equal space on
    both sides. The first item will have one unit of space against the container edge, but two units of
    space between the next item because that next item has its own spacing that applies.
  • space-evenly: items are distributed so that the spacing
    between any
    two items (and the space to the edges) is equal.



This defines the default behavior for how flex items are laid out along the cross axis on the current line.
Think of it as the justify-content version for the cross-axis (perpendicular to the main-axis).

.container {
align-items: stretch | flex-start | flex-end | center | baseline | first baseline
| last baseline;


  • stretch (default): stretch to fill the container (still
    respect min-width/max-width)
  • flex-start / start / self-start: items are placed at the start
    of the cross axis. The difference between these is subtle, and is about respecting the flex-direction
    rules or the writing-mode rules.
  • flex-end / end / self-end: items are placed at the end of the
    cross axis. The difference again is subtle and is about respecting flex-direction rules vs. writing-mode
  • center: items are centered in the cross-axis
  • baseline:  items are aligned such as their baselines align


This aligns a flex container’s lines within when there is extra space in the cross-axis, similar to how
justify-content aligns individual items within the main-axis.

.container {
align-content: flex-start | flex-end | center | space-between | space-around |
space-evenly | stretch;


  • normal (default): items are packed in their default position as if no value was set.
  • flex-start / start:  items packed to the start of the container. The (more supported) flex-start honors the
    flex-direction while start honors the writing-mode direction.
  • center: items centered in the container
  • space-between: items evenly distributed; the first line is at the start of the container while the last one is at the end
  • space-around: items evenly distributed with equal space around each line
  • space-evenly: items are evenly distributed with equal space around them
  • stretch: lines stretch to take up the remaining space