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

body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(120deg, #1a1a2e, #16213e);
  color: #fff;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  overflow-x: hidden;
}

header {
  text-align: center;
  margin: 40px 0 20px;
}

.main-heading {
  font-size: 2.5rem;
  letter-spacing: 2px;
  color: #00d4ff;
  text-shadow: 0 0 10px #00d4ff80;
}

.sub-heading {
  font-size: 1.1rem;
  color: #ccc;
  margin-top: 8px;
}

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

.panel {
    background-image: url("https://images.unsplash.com/photo-1558979158-65a1eaa08691?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    height: 80vh;
    margin: 30px;
    color: #fff;
    border-radius: 40px;
    flex: 0.5;
    position: relative;
    transition: flex 0.7s ease-in;
    cursor: pointer;
}

.panel h1 {
    font-size: 25px;
    position: absolute;
    bottom: 20px;
    left: 20px;
    margin: 0;
    opacity: 0;
}

.panel.active {
    flex: 5;
}

.panel.active h1 {
    opacity: 1;
    transition: opacity 0.3s ease-in 0.4s;
}

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

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