Flexbox properties
display
Properties for the Parent (flex container) display 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; /* or inline-flex */
}
Note that CSS columns have no effect on a flex container.
- flex-direction the four possible values of flex-direction being shown: top to bottom, bottom to top, right to left, and left to right
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
flex-wrap
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.
flex-flow
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;
}
Justify-content
you will understand by code.
.container {
justify-content: flex-start | flex-end | center | space-between | space-around | space-evenly | start | end | left | right ... + safe | unsafe;
}
- flex-start (default): items are packed toward the start of the flex-direction.
- flex-end: items are packed toward the end of the flex-direction.
- start: items are packed toward the start of the writing-mode direction.
- end: items are packed toward the end of the writing-mode direction.
- left: items are packed toward left edge of the container, unless that doesn’t make sense with the flex-direction, then it behaves like start.
- right: items are packed toward right edge of the container, unless that doesn’t make sense with the flex-direction, then it behaves like start.
- center: items are centered along the line
- space-between: items are evenly distributed in the line; first item is on the start line, last item on the end line
- space-around: items are evenly distributed in the line with equal 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.
Note that that browser support for these values is nuanced. For example, space-between never got support from some versions of Edge, and start/end/left/right aren’t in Chrome yet. MDN has detailed charts. The safest values are flex-start, flex-end, and center.
There are also two additional keywords you can pair with these values: safe and unsafe. Using safe ensures that however you do this type of positioning, you can’t push an element such that it renders off-screen (e.g. off the top) in such a way the content can’t be scrolled too (called “data loss”).
Browser support
align-items
.container {
align-items: stretch | flex-start | flex-end | center | baseline | first baseline | last baseline | start | end | self-start | self-end + ... safe | unsafe;
}
align-content
.container {
align-content: flex-start | flex-end | center | space-between | space-around | space-evenly | stretch | start | end | baseline | first baseline | last baseline + ... safe | unsafe;
}
gap, row-gap, column-gap
.container {
display: flex;
...
gap: 10px;
gap: 10px 20px; /* row-gap column gap */
row-gap: 10px;
column-gap: 20px;
}
Properties for the Children
(flex items)
order
.item {
order: 5; /* default is 0 */
}
flex-grow
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.item { flex-grow: 4; / default 0 / }
flex-shrink
This defines the ability for a flex item to shrink if necessary.
.item {
flex-shrink: 3; /* default 1 */
}
Negative numbers are invalid.
align-self
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