a:hover 
{
  background-color: rgb(255, 255, 0);
  text-decoration: none;
  animation: bgColor 2s infinite steps(1);
}
@keyframes bgColor {
20% {
    background-color: red;
  }
40% {
    background-color: aquamarine;
  }
60% {
    background-color: #F433FF;
  }
80% {
    background-color: #00FF00;
  }
}

.marquee {
  width: 450px;
  margin: 0 auto;
  overflow: hidden;
  box-sizing: border-box;
}

.wp-block-post-content a:where(:not(.wp-element-button)) {
    color: var(--wp--preset--color--contrast);
}