CSS Flex Container

Parent Element (Container)

The flex container becomes flexible by setting the display property to flex:

.flex-container {  
    display:  flex;  
}

CSS Flexbox Container Properties

The following table lists all the CSS Flexbox Container properties:

Property	Description
align-content	Modifies the behavior of the flex-wrap property. It is similar to align-items, but instead of aligning flex items, it aligns flex lines
align-items	Vertically aligns the flex items when the items do not use all available space on the cross-axis
display	Specifies the type of box used for an HTML element
flex-direction	Specifies the direction of the flexible items inside a flex container
flex-flow	A shorthand property for flex-direction and flex-wrap
flex-wrap	Specifies whether the flex items should wrap or not, if there is not enough room for them on one flex line
justify-content	Horizontally aligns the flex items when the items do not use all available space on the main-axis

flex-direction Property

The flex-direction property defines in which direction the container wants to stack the flex items.

Example: the column value stacks the flex items vertically (from top to bottom):

.flex-container {  
    display:  flex;  
    flex-direction:  column;  
}

Example: the column-reverse value stacks the flex items vertically (but from bottom to top):

.flex-container {  
    display:  flex;  
    flex-direction:  column-reverse;  
}

Example: the row value stacks the flex items horizontally (from left to right):

.flex-container {  
    display:  flex;  
    flex-direction:  row;  
}

Example: the row-reverse value stacks the flex items horizontally (but from right to left):

.flex-container {  
    display:  flex;  
    flex-direction:  row-reverse;  
}

flex-wrap Property

The flex-wrap property specifies whether the flex items should wrap or not.

Example: The wrap value specifies that the flex items will wrap if necessary

.flex-container {  
    display:  flex;  
    flex-wrap:  wrap;  
}

Example: the nowrap value specifies that the flex items will not wrap (this is default):

.flex-container {  
    display:  flex;  
    flex-wrap:  nowrap;  
}

Example: the wrap-reverse value specifies that the flexible items will wrap if necessary, in reverse order:

.flex-container {  
    display:  flex;  
    flex-wrap:  wrap-reverse;  
}

flex-flow Property

The flex-flow property is a shorthand property for setting both the flex-direction and flex-wrap properties.

.flex-container {  
    display:  flex;  
    flex-flow:  row wrap;  
}

justify-content Property

The justify-content property is used to align the flex items:

Example: the center value aligns the flex items at the center of the container.

.flex-container {  
    display:  flex;  
    justify-content:  center;  
}

Example: the flex-start value aligns the flex items at the beginning of the container (this is default).

.flex-container {  
    display:  flex;  
    justify-content:  flex-start;  
}

Example: the space-around value displays the flex items with space before, between, and after the lines.

.flex-container {  
    display:  flex;  
    justify-content:  space-around;  
}

align-items Property

The align-items property is used to align the flex items.

In these examples we use a 200 pixels high container, to better demonstrate the align-items property.

Example: the center value aligns the flex items in the middle of the container.

.flex-container {  
    display:  flex;  
    height:  200px;  
    align-items:  center;  
}

Example: the flex-start value aligns the flex items at the top of the container.

.flex-container {  
    display:  flex;  
    height:  200px;  
    align-items:  flex-start;  
}

Example: the flex-end value aligns the flex items at the bottom of the container.

.flex-container {  
    display:  flex;  
    height:  200px;  
    align-items:  flex-end;  
}

Example: the stretch value stretches the flex items to fill the container (this is default).

.flex-container {  
    display:  flex;  
    height:  200px;  
    align-items:  stretch;  
}

align-content Property

The align-content property is used to align the flex lines.

In these examples we use a 600 pixels high container, with the flex-wrap property set to wrap, to better demonstrate the align-content property.

Example: the space-between value displays the flex lines with equal space between them:

.flex-container {  
    display:  flex;  
    height:  600px;  
    flex-wrap:  wrap;  
    align-content:  space-between;  
}

Example: the space-around value displays the flex lines with space before, between, and after them:

.flex-container {  
    display:  flex;  
    height:  600px;  
    flex-wrap:  wrap;  
    align-content:  space-around;  
}

Example: the stretch value stretches the flex lines to take up the remaining space (this is default):

.flex-container {  
    display:  flex;  
    height:  600px;  
    flex-wrap:  wrap;  
    align-content:  stretch;  
}

Example: the center value displays display the flex lines in the middle of the container:

.flex-container  {  
    display:  flex;  
    height:  600px;  
    flex-wrap:  wrap;  
    align-content:  center;  
}

Example: the flex-start value displays the flex lines at the start of the container:

.flex-container {  
    display:  flex;  
    height:  600px;  
    flex-wrap:  wrap;  
    align-content:  flex-start;  
}

Example: the flex-end value displays the flex lines at the end of the container:

.flex-container {  
    display:  flex;  
    height:  600px;  
    flex-wrap:  wrap;  
    align-content:  flex-end;  
}

Another example: Perfect Centering

In the following example we will solve a very common style problem: perfect centering.

Set both the justify-content and align-items properties to center, and the flex item will be perfectly centered:

.flex-container {  
    display:  flex;  
    height:  300px;  
    justify-content:  center;  
    align-items:  center;  
}