body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #343a40;
    color: #fff;
    padding: 20px;
    text-align: center;
}

header h1 {
    margin: 0;
}

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

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

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

main {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section {
    margin-bottom: 40px;
}

h2 {
    color: #343a40;
    border-bottom: 2px solid #343a40;
    padding-bottom: 10px;
}

p {
    color: #555;
    line-height: 1.5;
}

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

footer {
    background-color: #343a40;
    color: #fff;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
    border-radius: 8px;
}

footer p {
    margin: 0;
}

.portfolio-item {
    margin-bottom: 20px;
}

.portfolio-item img {
    width: 100%;
    max-width: 100px;
    border-radius: 8px;
}

@media screen and (min-width: 768px) {
    .portfolio-item img {
        width: 50%;
        float: left;
        margin-right: 20px;
    }
}