body {
    font-family: sans-serif;
    max-width: 400px;
    margin: 40px auto;
    padding: 0 20px;
    text-align: center;
    box-sizing: border-box;
}

.btnRow {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 16px;
}

.btnCamera, .btnSend {
    flex: 1; 
}

.btnCamera {
    display: inline-block;
    background-color: #4CAF50;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    border: none;
}

.btnCamera:hover {
    background-color: #45a049;
}

.btnSend {
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    border: none;
    background-color: #2196F3;
    color: white;
    cursor: pointer;
}

.btnSend:disabled {
    background-color: #aaa;
    cursor: not-allowed;
}

.btnSend:not(:disabled):hover {
    background-color: #1976D2;
}

#preview {
    margin-top: 20px;
    width: 100%;
    max-width: 300px;
    border-radius: 8px;
    display: block;
    margin: 20px auto;
}