body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f1f1f1;
}

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
}

h1 {
    margin: 0;
}

#editor {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 20px;
    background-color: white;
    margin: 20px auto;
    max-width: 800px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

textarea {
    width: 100%;
    height: 150px;
    resize: none;
    border: 1px solid #ccc;
    border-radius: 3px;
    padding: 5px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #333;
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

iframe {
    display: block;
    width: 100%;
    height: 300px;
    border: none;
    margin-top: 20px;
    border-radius: 5px;
}