html, body {
    height: 100%;
    background: #262b2b;
    margin: 0;
    overflow: hidden;
}

.nav {
    background: black;
    color: white;
    padding: 10px;
    position: static;
}

.content {
    background: violet;
    overflow: auto;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto;
    height: calc(100%);
}

.hackfleisch {
    height: 100%;
    overflow: hidden;
}