body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}
header, footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em;
}
.container {
    width: 80%;
    margin: 0 auto;
    padding: 1em;
}
h1, h2, h3 {
    color: #333;
}
nav {
    margin: 1em 0;
    text-align: center;
}
nav a {
    margin: 0 1em;
    color: #333;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}
.section {
    padding: 2em 0;
    border-bottom: 1px solid #ddd;
}
.portfolio-item {
    display: inline-block;
    width: 30%;
    margin: 1%;
    background-color: #fff;
    padding: 1em;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}
.portfolio-item img {
    max-width: 100%;
    height: auto;
}