animation-iteration-count

This property lets you define how many times the animation will play through. The value is generally an integer, but you can also use numbers with decimal points (in which case, the animation will end partway through a run), or the value infinite for endlessly repeating animations. If omitted, it will default to 1, in which case the animation will occur only once
snippet
-webkit-animation-iteration-count: infinite;
Related Tutorial
11. animation