body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}

#wrapper {
    width: 80%;
    margin: 0 auto;
}

header {
    padding: 10px;
    background-color: #f2f2f2;
}

    header h1 {
        margin: 0;
        padding: 5px 0;
    }

    header > img {
        width: 20%;
        height: auto;
        float: right;
    }

.clearright {
    clear: right;
}

nav {
    background-color: #ddd;
    padding: 10px;
}

    nav > div {
        display: inline-block;
        margin-right: 15px;
    }

        nav > div > a {
            color: steelblue;
            font-weight: bold;
            text-decoration: none;
        }

            nav > div > a:hover {
                color: red;
                text-decoration: underline;
            }

main {
    display: flex;
    gap: 20px;
    padding: 10px;
}

    main > div {
        flex: 1;
    }

.left > img {
    width: 40%;
    height: auto;
    float: right;
    margin: 10px;
}

@media screen and (max-width: 1024px) {
    #wrapper {
        width: 95%;
    }

    header > img {
        width: 25%;
        height: auto;
        float: right;
    }
}

@media screen and (max-width: 510px) {
    main {
        flex-direction: column;
    }

        main > div {
            width: 100%;
        }

    header > img {
        width: 40%;
        height: auto;
        float: right;
    }

    .left > img {
        width: 100%;
        height: auto;
        float: none;
        margin: 0;
    }
}