body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 30px auto;
    padding: 20px;
    background: white;
    border-radius: 10px;
}

nav {
    background-color: #222;
    padding: 15px;
}

nav ul {
    list-style-type: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    text-decoration: underline;
}

/* Basic styling */
.navbar {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.navbar > li {
    display: inline-block;
    position: relative;
}

.navbar li a {
    padding: 10px 15px;
    display: block;
    background-color: #333;
    color: white;
    text-decoration: none;
}

.navbar li a:hover {
    background-color: #555;
}

.navbar li ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    z-index: 999;
    background-color: #333;
}

.navbar li:hover ul {
    display: block;
}

.navbar li ul li {
    display: block;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #222;
    color: #fff;
    margin-top: 30px;
}


table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: left;
}

th {
    background-color: #f5f5f5;
}

.total-row {
    font-weight: bold;
    background-color: #e8f4ff;
}

.error {
    color: red;
}

/* Dropdown menu styles */
.dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background-color: #333;
    z-index: 1000;
    flex-direction: column;
}

.navbar li:hover .dropdown {
    display: flex;
}

.dropdown li a {
    padding: 10px;
    background-color: #333;
    color: white;
    text-decoration: none;
}

.dropdown li a:hover {
    background-color: #555;
}