#drop_file_zone {
    background-color: #f7f7f7;
    border: #d8d8d8 2px dashed;
    height: 300px;
    padding: 8px;
    font-size: 18px;
}
#drag_upload_file {
    width:50%;
    margin:0 auto;
}
#drag_upload_file p {
    text-align: center;
}
#drag_upload_file #select_file {
    display: none;
}