trick1.css

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  display: flex;
  justify-content: center;
  align-items: center ;
  margin: 0;
  height: 70vh;
  background-color: crimson;
}
div{
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
div > b{
  color:#ffff;
  font-size: 25px;
  margin: 20px 0;
}

/* main part for bouncing */
div > h2{
  color:springgreen;
  font-size: 32px;
  animation: bounce 3s infinite ease-in-out;  /*bounce effect*/
}
/* use @keyframe for animation*/

@keyframes bounce {
  0%, 100% {
    transform: translateY(0); /* Start and end position */
  }
  25% {
    transform: translateY(-20px); /* First bounce */
  }
  50% {
    transform: translateY(0); /* Back to start */
  }
  75% {
    transform: translateY(-10px); /* Second bounce */
  }
}