body {
    background: white;
    color: black;
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
}
section {
    display: flex;
    height: 500px;
}

.left {
    background-color: grey;
    width: 300px;
}

.right {
    background-color: blue;
    display: flex;
    justify-content: flex-end;
    width: 300px;
}

.seite {
    width: 150px;
}