body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    text-align: center;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

input[type="text"], select {
    width: 100%;
    padding: 12px 20px;
    margin: 8px 0;
    display: block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.update-chart-btn {
    background-color: #4CAF50;
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: block;
    width: 100%;
}

.update-chart-btn:hover {
    background-color: #45a049;
}

.small-calc-time-btn {
    background-color: #007bff;
    color: white;
    padding: 2px 10px;
    font-size: 0.8rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    vertical-align: middle;
    width: 100px;
    display: inline;
}

.small-calc-time-btn:hover {
    background-color: #0056b3;
}

.time-label-button {
    display: inline-block;
}

label {
    display: inline;
    margin-right: 5px;
}

#graph {
    margin-top: 20px;
    width: 100%;
    aspect-ratio: 16 / 9;
    max-width: 100%;
}