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Here is a basic example of how you can create an animation of a fingerprint scanner using CSS:

1. First, create an HTML element with the class name "fingerprint-scanner" that will contain the scanner animation:

<div class="fingerprint-scanner">
  <div class="scanner"></div>
  <div class="fingerprint"></div>
</div>

1. Next, add CSS styling to position the scanner and fingerprint elements and set their sizes:

.fingerprint-scanner {
  position: relative;
  width: 150px;
  height: 150px;
}

.scanner {
  position: absolute;
  top: 25px;
  left: 25px;
  width: 100px;
  height: 100px;
  background-color: #CCC;
  border-radius: 50%;
  animation: scanner 2s ease infinite;
}

.fingerprint {
  position: absolute;
  top: 60px;
  left: 60px;
  width: 30px;
  height: 30px;
  background-color: #FFF;
  border-radius: 50%;
}

Note that the scanner element is given an animation property with the value "scanner 2s ease infinite", which is a reference to an animation keyframes rule that we'll define in the next step.

1. Lastly, add the animation keyframes rule to define the scanner animation:

@keyframes scanner {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

This keyframes rule defines a simple animation that scales the scanner element up by 20% and then back to its original size over a 2-second duration, with easing to make the animation appear smoother.