* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
}

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

.container {
  width: 90%;
  display: flex;
  justify-content: space-between;
}

.container > :nth-child(1) {
  background-color: red;
  color: black;
}

.container > :nth-child(2) {
  background-color: blue;
}

.container > :nth-child(3) {
  background-color: green;
}

.container > :nth-child(4) {
  background-color: yellow;
  color: black;
}

.tile {
  height: 80vh;
  flex: 1;
  border: 2px solid black;
  border-radius: 50px;
  position: relative;
  margin: 10px;
  cursor: pointer;
  transition: flex 0.5s ease-in 0s;
}

.tile > h1 {
  position: absolute;
  left: 20px;
  bottom: 20px;
  opacity: 0;
  transition: opacity 0.5s ease-in 0.2s;
}

.active {
  flex-grow: 10;
}

.active > h1 {
  opacity: 1;
}