animation-direction

Determines whether an animation runs forward or in reverse on some or all of its cycles.

Syntax

animation-direction: <value>;

where <value> can be one of the following:

• normal: Animation will play as specified.
• reverse: Animation will be played in the reverse direction as specified.
• alternate: causes the cycles to alternate between normal and reverse.
• alternate-reverse: causes the cycles to alternate between reverse and normal.

Example 1

Reverse the direction of the animation:

div {
  height: 200px;
  width: 200px;
  background-color: blue;
  animation-name: slideleft;
  animation-duration: 4s;
  animation-direction: reverse;
}

@keyframes slideleft {
  from {
    margin-left: 100%;
  }
  to {
    margin-left: 0%;
  }
}

Example 2

Set the first direction to alternate and the second direction to alternate-reverse:

div {
  height: 200px;
  width: 200px;
  background-color: blue;
  animation-name: fadeout, slideright;
  animation-duration: 4s, 4000ms;
  animation-iteration-count: 2;
  animation-direction: alternate, alternate-reverse;
}

@keyframes fadeout {
  from {
    background-color: blue;
  }
  to {
    background-color: white;
  }
}

@keyframes slideright {
  from {
    margin-left: 0%;
  }
  to {
    margin-left: 100%;
  }
}