@import url('https://fonts.googleapis.com/css2?family=Muli&display=swap');

* {
    box-sizing: border-box;
}


body {
    font-family: 'Muli', sans-serif;
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

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

.panel {
    background-size: cover 100%;
    background-position: center;
    background-repeat: no-repeat;
    height: 80vh;
    border-radius: 50px;
    color: #fff;
    cursor: pointer;
    flex: .5;
    margin: 10px;
    position: relative;
    transition: flex .7s ease-in;
}


.panel:first-of-type {
    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');
}

.panel:nth-of-type(2) {
    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');
}

.panel:nth-of-type(3) {
    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');
}

.panel:nth-of-type(4) {
    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');
}

.panel:last-of-type {
    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');
}

.panel h3 {
    font-size: 24px;
    position: absolute;
    bottom: 20px;
    left: 20px;
    margin: 0;
    opacity: 0;
    transition: opacity .3s ease-in .4s;
}

.panel.active {
    flex: 5;
}

.panel.active h3 {
    opacity: 1;
}

@media(max-width: 480px) {
    .container {
        width: 100vw;
    }

    .panel:nth-last-of-type(1),
    .panel:nth-last-of-type(2) {
        display: none;
    }
}