CSS animation to pulse section of image

Question

I'm using CSS animation on a simple image.
I want the pulse animation only to target part of the image.
How I can make that pulse animation so that only the text "Trello" changes opacity?

Here is my code:

.element {
  /*animation-delay: 2s;*/
  animation: pulse 3s infinite;
  margin: 0 auto;
  display: table;
  margin-top: 50px;
  animation-direction: alternate;
}

@keyframes pulse {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0.3;
  }
}

html,
body {
  height: 100%;
  background-color: #e74c3c;
}

<img src="https://d78fikflryjgj.cloudfront.net/images/50b4ebc64391dc394a38e73aed57f0e2/header-logo.png" alt="" class="element" />

View on CodePen

Answer 1

You can use this example for both. I hope it's helpful to you.

.pulse {
  animation: pulse 3s infinite;
  margin: 0 auto;
  display: table;
  margin-top: 50px;
  animation-direction: alternate;
  -webkit-animation-name: pulse;
  animation-name: pulse;
}
    
@-webkit-keyframes pulse {
  0% {
    -webkit-transform: scale(1);
  }
  50% {
    -webkit-transform: scale(1.1);
  }
  100% {
    -webkit-transform: scale(1);
  }
}
    
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

html,
body {
  height: 100%;
  background-color: #e74c3c;
}

<img src="https://d78fikflryjgj.cloudfront.net/images/50b4ebc64391dc394a38e73aed57f0e2/header-logo.png" alt="" class="pulse" />