body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header, logo, footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
}

.container {
    display: flex;
    flex-direction: row;
}

aside {
    width: 20%;
    padding: 15px;
    background-color: #f4f4f4;
}

main {
    width: 60%;
    padding: 15px;
}

.left {
    border-right: 1px solid #ccc;
}

.right {
    border-left: 1px solid #ccc;
}