style.css

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

* {
  box-sizing: border-box;
}

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

h2{
  display: inline;
  text-align: center;
  color: red;
  word-spacing: 5px;
}
.container {
  display: flex;
  width: 80vw;
}

.panel {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  height: 90vh;
  border-radius: 50px;
  color: #fff;
  cursor: pointer;
  flex: 0.5;
  margin: 10px;
  position: relative;
  -webkit-transition: all 700ms ease-in;
}
.panel.active {
    flex: 5;
  }
.panel h3 {
  font-size: 24px;
  position: absolute;
  bottom: 20px;
  left: 20px;
  margin: 0;
  opacity: 0;
}



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

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

  .panel:nth-of-type(4),
  .panel:nth-of-type(5) {
    display: none;
  }
}