body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

h1 {
    text-align: center;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: #f9f9f9;
}

label {
    display: block;
    margin: 10px 0 5px;
    font-size: small;
}

input[type="text"], input[type="number"], textarea {
    width: 90%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
}

button {
    padding: 6px 15px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

.output {
    margin: 15px 0;
    padding: 10px;
    background-color: #e7f4e8;
    border-left: 5px solid #4CAF50;
    font-size: small;
    width: 90%;
}

.history {
    background-color: #f0f0f0;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-bottom: 10px;
}