body {
    font-family: 'Segoe UI', Tahoma, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: navy;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: navy;
    color: #fff;
    padding: 26px;
    text-align: center;
    position: relative;
}

header h1 {
    margin: 0;
    font-size: 44px;
    position: relative;
}

.header-line {
    border: 0;
    border-top: 2px solid transparent; 
    margin: 20px auto; 
    width: 100px; 
    margin-left: 53.7%;
}

.active {
    position: relative;
}

.active::before {
    content: ''; 
    position: absolute; 
    top: -21px; 
    left: -13.5px; 
    width: 140%; 
    height: 2px; 
    background-color: crimson; 
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin-right: 20px;
    font-size: 22px;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
}

main {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.course {
    background-color: #fff;
    border: 4px solid #ddd;
    border-color: navy;
    padding: 20px;
    border-radius: 14px;
    margin-bottom: 20px;
    width: 100%;
    box-sizing: border-box;
    transition: background-color 0.3s;
}

a {
    text-decoration: none;
    color: inherit;
}


footer {
    text-align: center;
    padding: 10px;
    background-color: navy;
    color: #fff;
}

h2 {
    font-size: 2.2rem;
    margin-top: 0;
    margin-bottom: 10px;
    color: navy;
    text-align: center;
}

p {
    font-size: 1rem;
    line-height: 1.6;
    margin-top: 16px;
    margin-bottom: 20px;
}

.back-button {
    color: #fff;
    border: 4px solid;
    border-color: rgb(255, 242, 227);
    border-radius: 14px;
    padding: 10px;
    transition: background-color 0.3s;
}

.back-button:hover {
    background-color: crimson;
}

.form-group {
    margin-bottom: 15px;
}

.contact-form {
    background-color: #fff;
    border: 4px solid #ddd;
    border-color: navy;
    padding:22px;
    border-radius: 14px;
    margin: 0 auto;
    width: 60%;
    display: block;
    height: 82%;
}

.contact-form label,
.contact-form input,
.contact-form textarea,
.contact-form button {
    font-family:'Segoe UI', Tahoma, Verdana, sans-serif;
    font-size: 18px;
    padding: 10px;
    margin-bottom: 15px;
    display: block;
    color: navy;
}

.contact-form input,
.contact-form textarea {
    width: 98%;
    padding: 8px;
    border: 2px solid #ddd;
    border-radius: 8px;
    resize: none;
}

.contact-form textarea {
    width: 98%;
    padding: 8px;
    border: 2px solid #ddd;
    border-radius: 4px;
    resize: none;
    height: 117px;
}

.contact-form button {
    background-color: navy;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.contact-form button:hover {
    background-color: crimson;
}

.contact-heading {
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 10px;
    color: navy;
    text-align: center;
    margin-bottom: 12px;
    color: #fff;
}

.contact-container {
    text-align: center;
    margin: 0 auto;
    width: 60%;
}

.dropbtn {
    padding: 12px;
    cursor: pointer;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-image: linear-gradient(navy, steelblue);
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    border: 4px solid;
    border-color: #fff;
    border-radius: 16px;
    margin-top: 12px;
}

.dropdown-content a {
    color: #fff;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    border-radius: 14px;
}

.dropdown-content a:hover {
    background-color: crimson;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.confirmation-message {
    font-size: 1.2rem;
    margin-top: 10px;
    text-align: center;
    color: navy;
}