body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

header h1 {
    margin: 0;
}

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

nav ul li {
    margin-left: 15px;
}

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

main {
    padding: 20px;
}

.intro {
    text-align: center;
    margin-bottom: 20px;
}

.intro .btn {
    background-color: #333;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
}

.features {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.feature {
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin: 10px;
    flex: 1 1 300px;
}

.feature h3 {
    margin-top: 0;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}