SOURCE

<div class="container">
	<div class="panel" style="background-image: url('https://images.unsplash.com/photo-1558979158-65a1eaa08691?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')">
		<h3>Explore The World</h3>
	</div>
	<div class="panel" style="background-image: url('https://images.unsplash.com/photo-1572276596237-5db2c3e16c5d?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')">
		<h3>Wild Forest</h3>
	</div>
	<div class="panel" style="background-image: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1353&q=80')">
		<h3>Sunny Beach</h3>
	</div>
	<div class="panel" style="background-image: url('https://images.unsplash.com/photo-1551009175-8a68da93d5f9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1351&q=80')">
		<h3>City on Winter</h3>
	</div>
	<div class="panel" style="background-image: url('https://images.unsplash.com/photo-1549880338-65ddcdfd017b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')">
		<h3>Mountains - Clouds</h3>
	</div>
</div>

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
}

.container {
    display: flex;
    width: 90vw;
}

.panel {
    flex: 0.5;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 80vh;
    margin: 10px;
    cursor: pointer;
    transition: all 700ms ease-in;
}

.panel h3 {
    position: absolute;
    bottom: 20px;
    left: 20px;
    margin: 0;
    font-size: 24px;
    color: #fff;
    opacity: 0;
}

.panel:hover {
    flex: 5;
}

.panel:hover h3 {
    opacity: 1;
    transition: opacity 0.3s ease-in 0.4s;
}