body{
    margin: 0;
}
ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 15%;
    height: 100%;
    background-color: darkgray;
    position: fixed;
    overflow: auto;
}
li a {
    text-decoration: none;
    display: block;
    padding: 10px;
    color: black;
}
.content{
    margin-left: 15%;
    padding: 1px 20px;
}
.active{
    background-color: lightblue;
    color: rgb(0, 0, 0);
}
li a:hoer:not(.active) {
    background-color: cornflowerblue;
    color: skyblue;
}
.text-center {
    text-align: center;
}
a {
    text-decoration: none;
    color: black;
    background-color: brown;
    border-radius: 60px;
    padding: 26px;
}
.nav {
    padding-top: 100px;
    padding-bottom: 150px;
    text-align: center;
    font-size: 30px;
}
.container-6 {
    display: flex;
    justify-content: center;
}

a.clean {
    text-decoration: none;
    color: black;
    background-color: transparent;
    border-radius: 0;
    padding: 0;
}