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

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

.container {
    display: grid;
    grid-template-columns: 1fr 3fr;
    grid-template-rows: auto 1fr;
    height: 100vh;
    border: 1px solid green;
}

.header {
    grid-column: span 2;
    text-align: center;
    padding: 10px;
    border-bottom: 1px solid black;
}

.sidebar {
    border-right: 1px solid black;
    padding: 10px;
}

.content {
    padding: 10px;
}

.content .illustration {
    border: 1px solid black;
    padding: 20px;
    text-align: center;
}