.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    
}

h1 {
    text-align: center;
}

form {
    text-align: center;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
  }
  nav {
    background-color: #333;
    overflow: hidden;
  }
  nav a {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
  }
  nav a {
    float: left;
  }
 nav a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  nav a:hover {
    background-color: #111;
  }

#fileSizeInput {
    width: 100px;
}