body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #222;
}

header {
    background: #17365d;
    color: white;
    padding: 16px 24px;
}

main {
    max-width: 850px;
    margin: 24px auto;
    padding: 24px;
    background: white;
    border-radius: 8px;
}

input,
button {
    padding: 10px;
    margin: 5px 0;
    max-width: 100%;
}

button {
    cursor: pointer;
}

pre {
    overflow-x: auto;
    white-space: pre-wrap;
}

@media (max-width: 600px) {
    main {
        margin: 12px;
        padding: 16px;
    }

    input {
        display: block;
        width: 90%;
    }
}body {
}