JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flip-card">
  <div class="flip-card-inner">
    <div class="flip-card-front">
    </div>
    <div class="flip-card-back">
    </div>
  </div>
</div>
<div class="flip-card">
  <div class="flip-card-inner">
    <div class="flip-card-front">
    </div>
    <div class="flip-card-back">
    </div>
  </div>
</div>

CSS

.flip-card {
  background-color: transparent;
  width: 300px;
  height: 300px;
  perspective: 1000px; 
}
img{
	width: 300px;
	height: 300px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}


.flip-card:not(.flip-card_flipped):hover .flip-card-inner,
.flip-card_flipped .flip-card-inner {
  transform: rotateY(180deg);
}


.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
}


.flip-card-front {
  background-color: #bbb;
  color: black;
}


.flip-card-back {
  background-color: dodgerblue;
  color: white;
  transform: rotateY(180deg);
}

JavaScript

const cards = document.querySelectorAll('.flip-card');
let timerId = setTimeout(() => {
	cards.forEach(card => {
  	card.classList.add('flip-card_flipped');
    card.removeEventListener('mouseover', flipped);
  });
}, 5000);

function flipped() {
	clearTimeout(timerId);
  cards.forEach(card => card.removeEventListener('mouseover', flipped));
}

cards.forEach(card => card.addEventListener('mouseover', flipped));