style.css

* {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
  }
  body {
    font-family: Georgia, 'Times New Roman', Times, serif;
    background-image: url('https://wallpaperaccess.com/full/1092587.jpg');
    background-repeat: no-repeat;
  }
  #loading {
    position: fixed;
    width: 100%;
    height: 100%;
    background: black
      url('https://i.pinimg.com/originals/70/eb/0b/70eb0b53eb57c91db403928c5d02a19a.gif')
      no-repeat center;
    z-index: 1;
  }
  nav {
    height: 70px;
    background: linear-gradient(rgb(46, 13, 233), rgb(29, 247, 255));
    user-select: none;
    cursor: none;
  }
  .logo {
    font-family: 'Times New Roman', Times, serif;
    padding: 55px;
    font-size: 41px;
    font-weight: bold;
    line-height: 70px;
    color: gray;
    user-select: none;
  }
  nav ul {
    float: right;
    margin-right: 30px;
  }
  nav ul li {
    display: inline-block;
  }
  nav ul li a {
    color: red;
    display: block;
    padding: 0 15px;
    line-height: 70px;
    font-size: 20px;
    background: linear-gradient(rgb(46, 13, 233), rgb(29, 247, 255));
    transition: 1s;
  }
  nav ul li a:active,
  nav ul li a:hover {
    color: rgb(8, 253, 0);
  }
  nav ul ul {
    position: absolute;
    top: 85px;
    border-top: 1px solid rgb(0, 247, 255);
    opacity: 0;
    visibility: hidden;
  }
  nav ul li:hover > ul {
    top: 70px;
    opacity: 1;
    visibility: visible;
    transition: 0.2s linear;
  }
  nav ul ul li {
    width: 150px;
    display: list-item;
    position: relative;
    border: 1px solid rgb(0, 247, 255);
    border-top: none;
  }
  nav ul ul li a {
    line-height: 50px;
  }
  nav ul ul ul {
    border-top: none;
  }
  nav ul ul ul li {
    position: relative;
    top: -70px;
    left: 150px;
  }