style.css

*{
    margin: 0;
    padding: 0;
    
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}
body {
    background: #f2f2f2;
}
canvas {
    z-index: -1;
}
nav {
    background: #1b1b1b;
}
.heading {
    float: left;
    color: white;
    font-size: 27px;
    font-weight: 600;
    line-height: 70px;
    padding-left: 60px;

}
nav::after {
    content: '';
    clear: both;
    display: table;
}
nav ul {
    float: right;
    list-style: none;
    margin-right: 90px;
    position: relative;
}
nav ul li {
    /* float: left; */
    display: inline-block;
    background: #1b1b1b;
    margin: 0 5px;
}
nav ul li a {
    color: white;
    text-decoration: none;
    line-height: 70px;
    font-size: 18px;
    padding: 8px 15px;
}
nav ul li a:hover {
    color: cyan;
    border-radius: 5px;
    box-shadow: 0 0 5px #33ffff,
                0 0 5px #66ffff;
}
nav ul ul {
    position: absolute;
    top: 70px;
    opacity: 0;
    visibility: hidden;
    
}
nav ul li:hover > ul {
    opacity: 1;
    visibility: visible;
}
nav ul ul li {
    position: relative;
    margin: 0px;
    width: auto;
    float: none;
    display: list-item;
    border-bottom: 1px solid rgba(0,0,0,0.3);
}
nav ul ul li a {
    color: white;
    line-height: 50px;
    width: auto;
    font-size: 14px;
    padding: 8px 15px;
}