/* CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Grid Layout */
body {
    display: grid;
    grid-template-areas: 
        "header"
        "main"
        "footer";
}

header {
    grid-area: header;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #f4f4f4;
}

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

nav ul li {
    margin: 0 15px;
}

footer {
    grid-area: footer;
    text-align: center;
    padding: 20px;
    background-color: #f4f4f4;
}

/* Additional styles */
.main {
    grid-area: main;
    padding: 20px;
}