How can I change the speed of a CSS animation?

Question

I have animation:

img.rotate {
  animation-name: rotate;
  animation-duration: 1.5s;
  animation-iteration-count: inf         


        

Answer 1

You can do that by setting a wrapper, and counter-rotating it.

CSS

.wrapper, .inner {
    position: absolute;
    width: 100px;
    height: 100px;
  -webkit-animation-name: rotate;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-timing-function: linear;
  animation-name: rotate;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}
.wrapper {
    left: 40px;
    top: 40px;
  -webkit-animation-duration: 2.5s;
    -webkit-animation-play-state: paused;
    -webkit-animation-direction: reverse;
  animation-duration: 2.5s;
    animation-play-state: paused;
    animation-direction: reverse;
}
.wrapper:hover {
    -webkit-animation-play-state: running;
    animation-play-state: running;
}
.inner {
    display: block;
    background-color: red;
  -webkit-animation-duration: 1.5s;
  animation-duration: 1.5s;
}
@keyframes rotate {
  from { transform: rotate(0deg);  }
  to {    transform: rotate(360deg);  }
}    
@-webkit-keyframes rotate {
  from { -webkit-transform: rotate(0deg);  }
  to {    -webkit-transform: rotate(360deg);  }
}    

demo

(hover the square to slow it)