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

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

.container {
    display: flex; 
    justify-content:center;
    align-items: center;
    width: 90vw; 
     
}

.panel {
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    height: 90vh; 
    flex:0.5;
    position: relative; 
    border-radius: 50px;
    margin:10px;
    transition: flex 0.7s ease-in ;
}

.panel h3 {
    position: absolute;
    font-size: 3rem;
    color: #fff;
    bottom: 40px;
    left: 30px;
    opacity: 0;
    transition: opacity 0.3s ease-in 0.3s; 
}

.panel.active {
    flex: 4;
}

.panel.active h3 {
    opacity:1; 
}

@media screen and (max-width: 800px) {
    .panel:nth-child(4),
    .panel:nth-child(5),
    .panel:nth-child(6) {
        display:none;
        transition: opacity 1s ease-in 1s; 
    }
}