Author: Timelino

.container {
display: flex;
}

.container {
flex-direction: row | row-reverse | column | column-reverse;
}

.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

.container {
flex-flow: column wrap;
}

justify-content

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 |
space-evenly;
}

• 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 end.
• 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.

align-items

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
  rules.
• center: items are centered in the cross-axis
• baseline:  items are aligned such as their baselines align

align-content

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