body {
    margin: 0;
}

.navbar {
    list-style-type: none;
    margin: 0;
    padding: 160px 0px;
    width: 10%;
    background-color: blue;
    position: fixed;
    height: 100%;
    overflow: auto;
}

.navbar li a {
    display: block;
    color: gray;
    padding: 8px 16px;
    text-decoration: none;
}

.navbar li a.active {
    background-color: darkblue;
    color: white;
}

.navbar li a:hover:not(.active) {
    background-color: black;
    color: white;
}

.header, header {
    background-color: darkblue;
    border: 5px solid darkgray;
    position: fixed;
    width: 100%;
    height: 150px;
    z-index: 1;
}

.header h1 {
    text-align: center;
    color: white;
}

.content {
    margin-left: 10%;
    height: 1000px;
    padding: 161px 16px;
}