body{
    background: linear-gradient(135deg,#0f2027,#203a43,#2c5364);
    font-family: 'Segoe UI', sans-serif;
}

.card{
    border-radius:15px;
}

.drop-box{
    border:2px dashed #007bff;
    padding:30px;
    border-radius:10px;
    background:#f8f9fa;
    cursor:pointer;
}

#preview{
    max-height:400px;
}