* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f8f9fa; /* Màu nền trang */
    height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

nav ul.menu {
    list-style-type: none;
    text-align: center;
}

nav ul.menu li {
    display: inline;
    margin: 0 20px;
}

nav ul.menu li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    padding: 10px 10px;
}

nav ul.menu li a:hover {
    text-decoration: underline;
    background-color: #ccc;
    color: rgb(248, 243, 243);
}

nav ul.menu li a.active {
    background-color: #ccc; /* Màu sắc khi liên kết đang hoạt động */
    color: black;
    text-decoration: underline;
}

.content {
    padding: 20px;
    flex: 1;
}

.row {
    margin-bottom: 20px;
}

.card {
    border: 1px solid #ddd;
    border-radius: 5px;
    text-align: center;
    padding: 15px;
    background-color: #fff;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
}

.card h5 {
    margin-bottom: 15px;
}

.card a {
    display: inline-block;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
}

.card a:hover {
    background-color: #0056b3;
}