* {
    box-sizing: border-box;
}


html {
    min-height: 100%;
}


body {
    margin: 0;

    min-height: 100vh;

    padding: 30px 20px;

    background: #f5f5f5;

    color: #222;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Arial,
        sans-serif;

    line-height: 1.6;
}


.feed-page {
    display: flex;

    align-items: center;

    justify-content: center;

    min-height: calc(100vh - 60px);
}


.feed-box {
    width: 100%;

    max-width: 680px;

    padding: 40px;

    background: #ffffff;

    border: 1px solid #e0e0e0;

    border-radius: 12px;

    box-shadow:
        0 4px 20px rgba(
            0,
            0,
            0,
            0.05
        );
}


h1 {
    margin: 0 0 20px;

    font-size: 32px;

    line-height: 1.2;

    color: #222;
}


p {
    margin: 0 0 18px;
}


.feed-url {
    margin: 25px 0;

    padding: 15px 18px;

    background: #f8f9fa;

    border: 1px solid #d9dde1;

    border-radius: 7px;

    overflow-wrap: anywhere;
}


.feed-url a {
    color: #0d6efd;

    text-decoration: none;

    font-family:
        "SFMono-Regular",
        Consolas,
        "Liberation Mono",
        Menlo,
        monospace;

    font-size: 15px;
}


.feed-url a:hover {
    text-decoration: underline;
}


.feed-url a:focus {
    outline: 3px solid #9ec5fe;

    outline-offset: 3px;
}


.feed-note {
    margin-bottom: 0;

    color: #6c757d;

    font-size: 14px;
}


@media (max-width: 600px) {

    body {
        padding: 15px;
    }


    .feed-page {
        min-height: calc(100vh - 30px);
    }


    .feed-box {
        padding: 25px 20px;
    }


    h1 {
        font-size: 27px;
    }


    .feed-url {
        padding: 13px 14px;
    }

}