website.css

/* css reset */
*{
    margin: 0px;
    padding: 0px;
    color: white;
}

body{
    background: url(back1.jpg);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;

}
nav{
    background: #1b1b1b;

}
nav::after{
    content: '';
    clear: both;
    display: table;

}
nav ul{
    float: right;
    list-style: none;
    margin-right: 40px;
    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: 9px;
    box-shadow: 0 0 5px #33ffff;
   

}
nav ul ul li a:hover{
    color: cyan;
    box-shadow: none;

}
nav ul ul{
    position: absolute;
    top: 90px;
    border-top: 3px solid cyan;
    opacity: 0;
    visibility: hidden;
    transition: 0.3s;
}
nav ul li:hover>ul{
    top: 70px;
    opacity: 1;
    visibility: visible;
} 
nav ul ul ul{
    border-top: none;
}
nav ul ul li{
    position: relative;
    margin: 0px;
    width: 150px;
    float: none;
    display: list-item;
    border-bottom: 1px solid rgba(0,0,0,0.3);

}
nav ul ul li a{
    line-height: 50px;
}
nav ul ul ul li{
    position: relative;
    top: -70px;
    left: 150px;

}