body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #f4f4f4;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #4d65db;
    color: #fff;
    padding: 20px;
    box-sizing: border-box; /* Ensure padding does not cause overflow */
}

header h1 {
    margin: 0;
    font-size: 2.5em;
}

.logo img {
    max-width: 150px; /* Adjust to fit your needs */
    height: auto; /* Maintain aspect ratio */
}

main {
    padding: 20px;
    flex: 1;
    box-sizing: border-box; /* Ensure padding does not cause overflow */
}

.subject-menu {
    display: flex;
    flex-direction: column;
}

.subject-menu section {
    margin-bottom: 20px;
}

.subject-menu h2 {
    font-size: 2em;
    margin-bottom: 10px;
}

.subject-menu ul {
    list-style: none;
    padding: 0;
}

.subject-menu li {
    margin: 5px 0;
}

.subject-menu a {
    text-decoration: none;
    color: #007BFF;
    font-size: 1.2em;
}

.subject-menu a:hover {
    text-decoration: underline;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 15px; /* Adjust padding to fit better */
    position: relative;
    bottom: 0;
    width: 100%;
    box-sizing: border-box; /* Ensure padding does not cause overflow */
}

footer .btn {
    background-color: #007BFF;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    font-size: 1.2em;
    border-radius: 5px;
    display: inline-block;
}

footer .btn:hover {
    background-color: #0056b3;
}