* {
    box-sizing: border-box;
}

body {
    font-family: 'Muli', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}
.container{
    display: flex;
    width: 90vw;
}
.panel{
    background-size: cover;
    background-position: center;
    height: 80vh;
    border-radius: 50px;
    color: #fff;
    cursor: pointer;
    flex: 0.5;
    margin: 10px;
    position: relative;
    -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 0.4 ;
}