The align-content property determines how flex lines are aligned along the cross-axis while the align-items property determines how flex items are aligned within a flex line and along the cross-axis.
The align-content property is a sub-property of the Flexible Box Layout module. It helps to align a flex container's lines within it when there is extra space in the cross-axis, similar to how justify-content aligns individual items within the main-axis.
When working with flexbox you need to think in terms of two axes — the main axis and the cross axis. The main axis is defined by the flex-direction property, and the cross axis runs perpendicular to it. Everything we do with flexbox refers back to these axes, so it is worth understanding how they work from the outset.
align-items: stretch, The flexbox items will stretch across the whole cross axis. By default, the cross axis is vertical. This means the flexbox items will fill up the whole vertical space.
The CSS align-content property sets the distribution of space between and around content items along a flexbox's cross-axis or a grid's block axis. The interactive example below use Grid Layout to demonstrate some of the values of this property.
The flexbox items are aligned at the baseline of the cross axis. By default, the cross axis is vertical. This means the flexbox items will align themselves in order to have the baseline of their text align along a horizontal line. The flexbox items will stretch across the whole cross axis.
baseline. The flex item participates in baseline alignment: all participating flex items on the line are aligned such that their baselines align, and the item with the largest distance between its baseline and its cross-start margin edge is placed flush against the cross-start edge of the line.
Flex items within a flex container can be laid out either horizontally or vertically, but not both. If you want to lay out items in both dimensions, you'll need to nest a flex container inside another one. In this example we apply display: flex to both the outer container and to the red flex item.
The flex-basis property The initial value of this property is auto — in this case the browser looks to see if the items have a size. In the example above, all of the items have a width of 100 pixels and so this is used as the flex-basis . If the items don't have a size then the content's size is used as the flex-basis.
stretch. Flex items are stretched such that the cross-size of the item's margin box is the same as the line while respecting width and height constraints. ref. In your case, nothing will happen with stretch because of the height you set.
align-items: center, The flexbox items are aligned at the center of the cross axis. By default, the cross axis is vertical.
justify-content property is used to align flex items, the align-items property is used to align flex items vertically, the align-content property is used to align flex lines, flex-grow specifies how much a flex item will grow relative to rest of flex items.
flex-end. The cross-end margin edges of the flex items are flushed with the cross-end edge of the line. center. The flex items' margin boxes are centered within the line on the cross-axis. If the cross-size of an item is larger than the flex container, it will overflow equally in both directions.
Flexbox is a CSS3 layout model that solves usually tricky problems including how to position, center or dynamically resize elements on a page. It's a tool modern enough to create responsive designs and old enough to be implemented in major browsers.
The display:inline-flex does not make flex items display inline. It makes the flex container display inline. The main difference between display: flex and display: inline-flex is that display: inline-flex will make the flex container an inline element while it's content maintains its flexbox properties.
Quickly manage the layout, alignment, and sizing of grid columns, navigation, components, and more with a full suite of responsive flexbox utilities. For more complex implementations, custom CSS may be necessary.
When not to use flexboxDon't use flexbox for page layout. A basic grid system using percentages, max-widths, and media queries is a much safer approach for creating responsive page layouts. Don't add display:flex, to every single container div. Don't use flexbox if you have a lot of traffic from IE8 and IE9.Dec 22, 2015
You should consider using Flexbox when: You need a content-first design — Flexbox is the ideal layout system to create web pages if you don't know exactly how your content is going to look, so if you want everything just to fit in, Flexbox is perfect for that.
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