style.css

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 900px;
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 20px;
    margin-bottom: 30px;
}

header h1 {
    color: #0056b3;
    margin: 0;
}

h2 {
    color: #0056b3;
    margin-top: 0;
}

.input-section, .output-section, .history-section {
    margin-bottom: 30px;
}

textarea {
    width: 100%;
    height: 120px;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
    resize: vertical;
}

button {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 18px;
    cursor: pointer;
    margin-top: 15px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.result-container, .history-container {
    background-color: #f8f9fa;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    padding: 20px;
    min-height: 100px;
}

.history-entry {
    border-bottom: 1px solid #eee;
    padding: 15px 0;
}

.history-entry:last-child {
    border-bottom: none;
}

.history-entry p {
    margin: 5px 0;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #e0e0e0;
    font-size: 14px;
    color: #777;
}