align-self

Свойство CSS align-self выравнивает flex-элементы по текущей flex-линии, переопределяя значение свойства align-items. Если у какого-либо flex-элемента margin в поперечной оси выставлен в auto, то align-self игнорируется.

Данное свойство не применяется к block-level boxes и к ячейкам таблицы

Подробнее и больше информации читайте в Using CSS flexible boxes.

auto

Computes to the parent's align-items value.

normal

The effect of this keyword is dependent of the layout mode we are in:

• In absolutely-positioned layouts, the keyword behaves like start on replaced absolutely-positioned boxes, and as stretch on all other absolutely-positioned boxes.
• In static position of absolutely-positioned layouts, the keyword behaves as stretch.
• For flex items, the keyword behaves as stretch.
• For grid items, this keyword leads to a behavior similar to the one of stretch, except for boxes with an aspect ratio or an intrinsic sizes where it behaves like start.
• The property doesn't apply to block-level boxes, and to table cells.

self-start

Aligns the items to be flush with the edge of the alignment container corresponding to the item's start side in the cross axis.

self-end

Aligns the items to be flush with the edge of the alignment container corresponding to the item's end side in the cross axis.

flex-start

The cross-start margin edge of the flex item is flushed with the cross-start edge of the line.

flex-end

The cross-end margin edge of the flex item is flushed with the cross-end edge of the line.

center

The flex item's margin box is centered within the line on the cross-axis. If the cross-size of the item is larger than the flex container, it will overflow equally in both directions.

baseline first baseline last baseline

Specifies participation in first- or last-baseline alignment: aligns the alignment baseline of the box's first or last baseline set with the corresponding baseline in the shared first or last baseline set of all the boxes in its baseline-sharing group. The fallback alignment for first baseline is start, the one for last baseline is end.

stretch

If the combined size of the items along the cross axis is less than the size of the alignment container and the item is auto-sized, its size is increased equally (not proportionally), while still respecting the constraints imposed by max-height/max-width (or equivalent functionality), so that the combined size of all auto-sized items exactly fills the alignment container along the cross axis.

safe

If the size of the item overflows the alignment container, the item is instead aligned as if the alignment mode were start.

unsafe

Regardless of the relative sizes of the item and alignment container, the given alignment value is honored.

align-self = 
  auto                                  |
  normal                                |
  stretch                               |
  <baseline-position>                   |
  <overflow-position>? <self-position>  |
  anchor-center                         

<baseline-position> = 
  [ first | last ]?  &&
  baseline           

<overflow-position> = 
  unsafe  |
  safe    

<self-position> = 
  center      |
  start       |
  end         |
  self-start  |
  self-end    |
  flex-start  |
  flex-end    

• CSS Flexbox Guide: Basic Concepts of Flexbox
• CSS Flexbox Guide: Aligning items in a flex container
• CSS Grid Guide: Box alignment in CSS Grid layouts
• CSS Box Alignment
• The align-items property