body {
  font-family: 'arial';
  background-color: #81beff; ;
}

#menu {
  z-index: 13;
}

#menu-bar {
  width: 45px;
  height: 20px;
  margin: 10px 0 10px 10px;
  cursor: pointer;
}

.bar {
  height: 5px;
  width: 100%;
  background-color: #232323;
  display: block;
  border-radius: 5px;
  transition: 0.3s ease;
}

#bar1 {
  transform: translateY(-4px);
}

#bar3 {
  transform: translateY(4px);
}

.nav {
  transition: 0.3s ease;
  display: none;
}

.nav ul {
  padding: 0 22px;
}

.nav li {
  list-style: none;
  padding: 5px 0;
}

.nav li a {
  color: white;
  font-size: 18px;
  text-decoration: none;
}

.nav li a:hover {
  font-weight: bold;
}

.menu-bg, #menu {
  top: 0;
  left: 0;
  position: fixed;
  margin-top: 5px;
}

.menu-bg {
  z-index: 11;
  width: 0;
  height: 0;
  margin: 48px 0 20px 20px;
  background: radial-gradient(circle, #1578d8, #81beff);
  border-radius: 50%;
  transition: 0.3s ease;
}

.change {
  display: block;
}

.change .bar {
  background-color: white;
}

.change #bar1 {
  transform: translateY(4px) rotateZ(-45deg);
}

.change #bar2 {
  opacity: 0;
}

.change #bar3 {
  transform: translateY(-6px) rotateZ(45deg);
}

.change-bg {
  width: 520px;
  height: 460px;
  transform: translate(-60%,-30%);
}