<div class="ball"></div>
<div class="footer"><p>Created by <a href="https://www.rembertdesigns.co/" target="_blank">Richard Rembert</a></p>
</div>

.ball {
  border-radius: 50%;
  width: 200px;
  height: 200px;
  background-color: red;
  border: 2px solid #000;
  animation: bounce 1s infinite alternate;
}

@keyframes bounce {
  from {
    margin-top: 0;
  }
  to {
    margin-top: -250px;
  }
}

body,
html {
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  margin-top: 250px;
  background-color: #D2F8D2; 
}
.footer {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1rem;
  background-color: #fff;
  text-align: center;
}
.footer p {
text-decoration: none;
color: #000;
}
.footer a {
  text-decoration: none;
  color: red;
}
.footer a:hover {
  text-decoration: underline;
  color: blue;
}