body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
}

.container {
    max-width: 500px;
    margin: 20px auto;
    background: white;
    padding: 20px;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

.section {
    margin-bottom: 20px;
}

input[type="number"] {
    width: calc(100% - 110px);
    padding: 8px;
    font-size: 1em;
    margin-right: 10px;
}

button {
    margin-top: 10px;
    padding: 8px 12px;
    font-size: 1em;
    font-weight: bold;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin: 10px auto;
}

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

.results div {
    margin-top: 0px;
    font-size: 1.1em;
}

#history-list {
    list-style-type: none;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    font-size: 0.9em;
    background: #f4f4f4;
}