body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #121212;
    color: #ffffff;
}
.header {
    display: flex;
    align-items: center;
    padding: 20px;
    background-color: #1e1e1e;
    border-bottom: 1px solid #333;
}
.logo {
    margin-right: auto;
}
.logo img {
    height: 40px;
}
.nav {
    display: flex;
}
.nav a {
   color: #ffffff;
    text-decoration: none;
    padding: 0 20px;
    line-height: 40px;
}
.nav a:hover {
    background-color: #333;
}
.content {
    padding: 20px;
}