html {
    font-family: sans-serif;
}

header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
    background: red;
    padding: 10px;

    #logo {
        display: flex;
        align-items: center;
        font-size: 24px;
        height: 50px;
        color: inherit;
        text-decoration: inherit;

        img {
            height: 100%;
            margin-right: 10px;
        }
    }

    nav {
        margin-top: 10px;
        margin-left: auto;

        ul {
            list-style: none;
            padding: 0;
            margin: 0;

            li {
                display: inline-block;
                margin-left: 10px;
            }
        }
    }
}

main {
    background: green;
    margin: auto;
    max-width: 800px;
    padding: 20px;
}