@import url('https://fonts.googleapis.com/css2?family=Muli:wght@400;700&display=swap');

* {
    box-sizing: border-box; /*if we add border or padding, it doesn't affect the width of it. */
}
body {
    font-family: 'Muli', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    height: 100vh;
    overflow: hidden; /*don't want scroll bar to appear.*/
    margin: 0;
}

h1 {
    color: #afafaf;
    font-size: 1.5rem;
}

.container {
    display: flex;
    width:90vw;
}
.panel {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height:80vh;
    border-radius: 50px;
    color: #fff;
    cursor: pointer;
    flex:0.5;
    margin:8px;
    position: relative;
    transition: flex 0.7s ease-in;
    -webkit-transition: all 700ms ease-in;
}
.panel h3 {
    font-size: 24px;
    position: absolute;
    bottom: 20px;
    left: 20px;
    margin: 0;
    opacity: 0;
}
.panel.active {
    flex:5;
}
.panel.active h3 {
    opacity: 1;
    transition: opacity 0.3s ease-in 0.4s; /*last one is delay*/
}
@media (max-width:480px){
    container{
        width: 100vw;
    }
    .panel:nth-of-type(4), .panel:nth-of-type(5) {
        display: none;
    }
    
}