body {
    font-family: Arial, sans-serif;
    padding: 20px;
}
input, textarea {
    width: 300px;
    padding: 5px;
    margin: 5px 0;
}
button {
    padding: 10px;
    background: green;
    color: white;
    border: none;
    cursor: pointer;
}
table {
    width: 100%;
    border-collapse: collapse;
}
td[contenteditable="true"] {
    background: #f9f9f9;
}