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


body {
  background-color: royalblue; 
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow-x: hidden;
}

.alert{
  color: wheat;
  font-size: 40px;
  margin:20px;
text-align: center;
}

.container {
  display: flex;
  width: 100vw;
}

.box {
  background-size: auto 100%;
  background-position: center;
  background-repeat: no-repeat;
  object-fit: cover;
  border-radius: 50px;
  height: 80vh;
  color: white;
  cursor: pointer;
  flex: 0.5;
  margin: 10px;
  position: relative;
  transition: flex 0.7s ease-in;
}

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

.box.active {
  flex: 5;
}

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

@media (max-width: 768px) {
  .container {
    width: 100vw;
  }

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

  .alert{
    display: none;
  }
}