body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

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

av ul li {
    margin: 0 1rem;
}

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

main {
    padding: 1rem;
}

section {
    padding: 2rem 0;
    text-align: center;
}

#hero {
    background-color: #ddd;
}

.project-card {
    border: 1px solid #ccc;
    padding: 1rem;
    margin: 1rem 0;
    background-color: white;
}

@media (min-width: 768px) {
    #projects {
        display: flex;
        justify-content: space-around;
    }

    .project-card {
        width: 45%;
    }
}