animate opacity css code example

Example 1: how to make animation stay on 100%

animation-fill-mode:forwards;

Example 2: css opacity animation

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

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

Example 3: opacity animation css

<style>
	.element-class {
		opacity: 0.5;
      	transition: opacity 0.5s ease-in-out;
	}
</style>

Example 4: transparent background css

div {
  width: 200px;
  height: 200px;
  display: block;
  position: relative;
}

div::after {
  content: "";
  background: url(image.jpg);
  opacity: 0.5;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;   
}