Flexbox

Flexboxen sind für eindimensionale Layouts, also Reihe oder Spalte. Der Container an dem display: flex gesetzt wird, ist der Flexcontainer, die direkten Unterelemente die Flex Children.

Simple example

.container {
	/*Flex Container*/
	display: flex;
}

.container > div {
	/*Flex Child*/
	flex: 1 1 auto;
}

Container

---

Container Art

display: flex;
display: inline-flex;

Ausrichtung

In welcher Reihenfolge und in welcher Richtung die Elemente angeordnet werden

flex-direction: row; /* left-right - default */
flex-direction: row-reverse; /* right-left */
flex-direction: column; /* top-bottom */
flex-direction: column-reverse; /* bottom-top */

Wrap

flex-wrap: nowrap; /* one-line */
flex-wrap: wrap; /* multi-line */

Ausrichtung senkrecht zur flex-direction

align-items: flex-start; /* vertical-align to top */
align-items: flex-end;   /* vertical-align to bottom */
align-items: center;     /* vertical-align to center */
align-items: stretch;    /* same height on all (default) */

Ausrichtung mit der flex-direction

justify-content: flex-start;    /* [xxx        ] */
justify-content: center;        /* [    xxx    ] */
justify-content: flex-end;      /* [        xxx] */
justify-content: space-between; /* [x    x    x] */
justify-content: space-around;  /* [ x   x   x ] */
justify-content: space-evenly;  /* [  x  x  x  ] */

Children (Flex Items)

---

/* This: */
flex: 1 0 auto; /*grow shrink basis*/
 
/* Is equivalent to this: */
flex-grow: 1; /*Breite relativ zu den anderen Elementen, wenn die Basisbreite vergrößert wird*/
flex-shrink: 0;/*Breite relativ zu den anderen Elementen fest, wenn die Basisbreite verkleinert wird*/
flex-basis: auto; /*Basisbreite eines Flex-Items*/

order: 1; /*Position (-1 = Anfang)*/

align-self: flex-start; /* left */
margin-left: auto; /* right */

CSS Flexbox Tricks

---

Vertical center

.container {
  display: flex;
}
 
.container > div {
  width: 100px;
  height: 100px;
  margin: auto;
}

Reordering

.container > .top {
  order: 1;
}
 
.container > .bottom {
  order: 2;
}

Mobile layout

.container {
  display: flex;
  flex-direction: column;
}
 
.container > .top {
  flex: 0 0 100px;
}
 
.container > .content {
  flex: 1 0 auto;
}

A fixed-height top bar and a dynamic-height content area.

Table-like

.container {
  display: flex;
}
 
/* the 'px' values here are just suggested percentages */
.container > .checkbox {
  flex: 1 0 20px;
}
.container > .subject {
  flex: 1 0 400px;
}
.container > .date {
  flex: 1 0 120px;
}

This creates columns that have different widths, but size accordingly according to the circumstances.