body {
    font-family: 'Vazir', sans-serif;
    background-color: #f8f9fa;
}
.card {
    max-width: 400px;
    margin: auto;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
canvas {
    border: 1px solid #ced4da;
    width: 100%;
}


#signature-container {
    max-width: 100%;
    padding: 1rem;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
}

#signature-pad {
    width: 90%; /* یا هر اندازه‌ای که می‌خواهی */
    height: 250px; /* ثابت */
    max-width: 500px;
    aspect-ratio: 3 / 1;
    max-height: 250px;
    border: 2px solid #007bff;
    border-radius: 8px;
    background-color: #fff;
    touch-action: none;
}