ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: chartreuse;
    position:fixed;
    top:0;
    width: 100%;

}
li{
    float: left;
}
li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover:not(.active) {
    background-color: orange;
}
.active{
    background-color: yellowgreen;
}
div{padding: 20px; margin-top: 10px  ;height: 1500px;

}