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

* {
  box-sizing: border-box;
}

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

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

.panel{
    background-size: auto 100%;
    background-position: center;
    background-repeat: no-repeat;
    height: 80vh;
    border-radius: 50px;
    color: #fff;
    cursor: pointer;
    flex: 0.5;
    margin: 10px;
    position: relative;
    transition: flex 0.7s ease-in;

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

}
.panel.active{
    flex: 5;
}

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

@media (max-width: 480px) {
  .container {
    width: 100%;
  }
  .panel:nth-of-type(4),
  .panel:nth-of-type(5) {
    display: none;
  }
}