styles.css

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.overlay {
  position: fixed;
  background-color: #7ba9c3;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  opacity: 0;
  visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.3s, visibility 0.3s, height 0.3s;
}

nav {
  font-size: 2rem;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

nav ul li {
  opacity: 0;
  margin: 1rem 0;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  transition: opacity 0.2s ease;
  opacity: 0.75;
}

nav ul li a:hover {
  opacity: 1;
}

@keyframes fadeInLeft {
  0% {
    opacity: 0;
    transform: translate3d(-25%, 0, 0);
  }

  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

.overlay.visible {
  opacity: 0.85;
  visibility: visible;
  height: 100%;
}

.overlay.visible li {
  animation: fadeInLeft 0.2s ease forwards;
}

.overlay.visible li:nth-of-type(1) {
  animation-delay: 0.23s;
}

.overlay.visible li:nth-of-type(2) {
  animation-delay: 0.26s;
}

.overlay.visible li:nth-of-type(3) {
  animation-delay: 0.29s;
}

.overlay.visible li:nth-of-type(4) {
  animation-delay: 0.32s;
}

.overlay.visible li:nth-of-type(5) {
  animation-delay: 0.35s;
}