body {
    margin: 0;
}
ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 15%;
    height: 100ch;
    background-color: rgb(218, 238, 255);
    position: fixed;
    overflow: auto;
}
li a {
    text-decoration: none;
    display: block;
    padding: 10px;
    color: hsl(240, 49%, 16%);
    border-bottom: 1px solid hsl(240, 49%, 16%);;
}
.content {
    margin-left: 15%;
    padding: 1px 20px;
}
.active {
    background-color: rgb(186, 93, 240);
}
li a:hover:not(.active) {
    background-color: bisque;
    color: aqua;
}