body {
    font-family: 'Arial', sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 300px;
}

h2 {
    color: #333;
}

input[type="file"] {
    display: block;
    margin: 20px auto;
}

button {
    background-color: #4caf50;
    color: white;
    border: none;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

#progress-bar {
    width: 100%;
    background-color: #f3f3f3;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 20px;
}

#progress-bar-fill {
    height: 24px;
    width: 0;
    background-color: #4caf50;
    text-align: center;
    line-height: 24px;
    color: white;
}

#upload-speed, #average-speed, #upload-time, #remaining-time, #file-size {
    margin-top: 10px;
    color: #555;
}