body {
    margin: 0;
    background-color: lightyellow;
    color: black;
    font-family: Arial, sans-serif;
    line-height: 1.5;
}

header {
    background-color: darkblue;
    color: white;
    text-align: center;
    padding: 20px;
}

nav {
    background-color: lightblue;
    padding: 10px;
    text-align: center;
}

nav a {
    margin: 10px;
}

main {
    max-width: 800px;
    margin: auto;
    padding: 20px;
}

section {
    margin-bottom: 30px;
}

h2 {
    color: darkblue;
}

figure {
    margin: 20px 0;
}

img {
    max-width: 100%;
    height: auto;
    border: 2px solid gray;
}

figcaption {
    font-size: 0.9em;
    color: #555;
    font-style: italic;
}

article {
    background-color: white;
    border: 1px solid gray;
    padding: 15px;
    margin-bottom: 20px;
}

details {
    margin-top: 15px;
    padding: 10px;
    background-color: #eeeeee;
}

summary {
    cursor: pointer;
    font-weight: bold;
}

aside {
    background-color: #fff3cd;
    border-left: 4px solid orange;
    padding: 15px;
    margin-bottom: 30px;
}

footer {
    background-color: darkblue;
    color: white;
    text-align: center;
    padding: 10px;
}