body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    max-width: 900px;
    width: 100%;
    box-sizing: border-box;
}

h2 {
    margin-bottom: 20px;
    color: #25292c;
    text-align: center;
}

h4 {
    margin-bottom: 20px;
    color: #091a77;
    text-align: center;
}

#sample-files {
    margin-bottom: 20px;
    font-size: 14px;
    max-height: 250px;
    overflow-y: auto;
}

.sample-file-item {
    margin-bottom: 5px;
}

#drop-zone {
    border: 2px dashed #3498db;
    padding: 20px;
    border-radius: 4px;
    text-align: center;
    margin-bottom: 10px;
    cursor: pointer;
    background-color: #ecf0f1;
    color: #2c3e50;
    transition: background-color 0.3s;
    height:100px;
}

#drop-zone.dragover {
    background-color: #d5e5fa;
}

button {
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 5px;
    font-size: 14px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

#message {
    margin-top: 15px;
    color: #e74c3c;
}