body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #333;
    color: white;
    padding: 10px 20px;
}
header a,
header a:visited,
header a:hover,
header a:active,
header a:focus {
  color: white;
  text-decoration: none;
}

nav a {
    margin-right: 10px;
    text-decoration: none;
}
.login-container {
    width: 300px;
    margin: 100px auto;
    padding: 20px;
    background: white;
    border-radius: 5px;
}
.login-container h2 {
    text-align: center;
}
.login-container input {
    width: 100%;
    padding: 8px;
    margin: 5px 0 15px;
}
.login-container button {
    width: 100%;
    padding: 10px;
    background-color: #333;
    color: white;
    border: none;
}
.error {
    color: red;
    text-align: center;
}

table {
  border-collapse: collapse;
}
 th {
  background: #ccc;
}

th, td {
  border: 1px solid #ccc;
  padding: 8px;
}

tr:nth-child(even) {
  background: #efefef;
}

tr:hover {
  background: #d1d1d1;
}