css opacity vs transparency code example

Example 1: css opacity animation

<style>
.myelement{
  animation: fade-out;
}

@keyframes fade-out{
  0%{
    opacity: 1.0
  }
  100{
    opacity: 0.0
  }
}
</style>

Example 2: define element opacity css

div {
  opacity: 0.5;
}