body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}
header {
    background-color: #1a3c5e;
    color: white;
    text-align: center;
    padding: 1em;
}
nav {
    background-color: #2a5c8e;
    padding: 1em;
}
nav ul {
    list-style-type: none;
    padding: 0;
    text-align: center;
}
nav ul li {
    display: inline;
    margin: 0 1em;
}
nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}
nav ul li a:hover {
    text-decoration: underline;
}
main {
    max-width: 800px;
    margin: 2em auto;
    padding: 1em;
    background-color: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
article {
    margin-bottom: 2em;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
}
th, td {
    border: 1px solid #ccc;
    padding: 0.5em;
    text-align: left;
}
th {
    background-color: #2a5c8e;
    color: white;
}
img {
    display: block;
    max-width: 100%;
    height: auto;
    margin-left: auto;
    margin-right: auto;
}
footer {
    text-align: center;
    padding: 1em;
    background-color: #1a3c5e;
    color: white;
}