body, html {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background-color: #777;
    color: #fff;
}

header, footer {
    background-color: #333;
    padding: 10px;
}

main {
    display: flex;
    flex: 1;
    padding: 10px;
    gap: 10px;
}

.lColumn, .rColumn {
    box-shadow: 0 4px 6px #ced46d;
    border-radius: 10px;
    background-color: #555;
    padding: 20px;
}

.lColumn {
    flex: 1; 
}

.rColumn {
    flex: 2; 
    display: flex;
    flex-direction: column;
    gap: 20px;
}