#nav-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  height: 20px;
  width: 20px;
  cursor: pointer;
}
#nav-toggle > div {
  position: relative;
  width: 20px;
}
#nav-toggle span {
  width: 100%;
  height: 1px;
  left: 0;
  display: block;
  background: #fff;
  position: absolute;
  transition: transform 0.6s ease-in-out, top 0.5s ease;
}
#nav-toggle span:nth-child(1) {
  top: 0;
}
#nav-toggle span:nth-child(2) {
  top: 7px;
}
#nav-toggle span:nth-child(3) {
  top: 14px;
}

.open #nav-toggle span {
  background: #000;
}
.open #nav-toggle span:nth-child(1) {
  top: 7px;
  transform: rotate(45deg);
}
.open #nav-toggle span:nth-child(2) {
  top: 14px;
  width: 0;
  left: 50%;
}
.open #nav-toggle span:nth-child(3) {
  top: 7px;
  transform: rotate(-45deg);
}

#gloval-nav {
  background-color: rgba(255, 255, 255, 0.9);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  transform: translateX(-100%);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#gloval-nav a {
  display: block;
  color: #fff;
  padding: 20px 0;
  transition: color 0.6s ease;
}
#gloval-nav ul li {
  opacity: 0;
  list-style: none;
  transform: translateX(-200px);
  transition: transform 0.6s ease, opacity 0.2s ease;
}
#gloval-nav ul li:nth-child(2) {
  transition-delay: 0.15s;
}
#gloval-nav ul li:nth-child(3) {
  transition-delay: 0.3s;
}
#gloval-nav ul li:nth-child(4) {
  transition-delay: 0.45s;
}

/* open */
.open {
  overflow: hidden;
}
.open #gloval-nav {
  visibility: visible;
  transform: translateX(0);
  transition: transform 0.6s;
}
.open #gloval-nav li {
  opacity: 1;
  transform: translateX(0);
  transition: transform 1s ease, opacity 0.9s ease;
}

#nav-toggle {
  z-index: 100;
}

#gloval-nav {
  z-index: 10;
}

.section {
  padding: 70px 20px;
  height: 100vh;
  text-align: center;
}
.section span {
  font-weight: bold;
  font-size: 30px;
}
.section p {
  font-size: 18px;
  line-height: 1.8;
}
.section:first-child {
  background-color: red;
}
.section:nth-child(2) {
  background-color: greenyellow;
}
.section:nth-child(3) {
  background-color: hotpink;
}
.section:nth-child(4) {
  background-color: lightcoral;
}