.nav-container {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  clip-path: circle(25px at 45px 45px);
  transition: all 0.3s ease-in-out;
  background: rgba(0, 0, 0, 0);
  z-index: 50;
}

#active:checked ~ .nav-container {
  background: rgba(0, 0, 0, 1);
  clip-path: circle(75%);
}

.menu-btn {
  position: fixed;
  z-index: 60;
  left: 20px;
  top: 20px;
  height: 50px;
  width: 50px;
  text-align: center;
  line-height: 50px;
  border-radius: 50%;
  font-size: 20px;
  color: #fff;
  cursor: pointer;
  background: #000;
  transition: all 0.3s ease-in-out;
  overflow: hidden;
}

.menu-btn::before {
  content: '☰';
  font-weight: bold;
  font-size: 1.5em;
}

.menu-btn:hover {
  background: #333;
}

.nav-container ul {
  position: absolute;
  top: 35%;
  left: 50%;
  transform: translate(-50%, -50%);
  list-style: none;
  text-align: center;

  font-family: 'Playwrite AT', cursive;
  font-optical-sizing: auto;
  font-style: normal;
}

.nav-container ul li {
  margin: 15px 0;
}

.nav-container ul li a {
  text-decoration: none;
  font-size: 3.5vh;
  padding: 5px 30px;
  color: #fff;
  border-radius: 4vh;
  background: #000;
  position: relative;
  transition: all 0.3s ease;
}

.nav-container ul li a:after {
  position: absolute;
  content: '';
  background: linear-gradient(#14ffe9, #ffeb3b, #ff00e0);
  width: 104%;
  height: 110%;
  left: -2%;
  top: -5%;
  border-radius: 5vh;
  transform: scaleY(0);
  z-index: -10;
  animation: rotate 1.5s linear infinite;
  transition: transform 0.3s ease;
}

.nav-container ul li a:hover:after {
  transform: scaleY(1);
}

.nav-container ul li a:hover {
  color: #fff;
}

input[type='checkbox'] {
  display: none;
}

@keyframes rotate {
  0% {
    filter: hue-rotate(0deg);
  }
  100% {
    filter: hue-rotate(360deg);
  }
}