body {
    padding: 20px;
}

th, tr, td {
    border: 1px solid black;
}

section {
    display: flex;
}

div {
    width: 50%;
    height: 200px;
    border: 1px solid black;
}    
.dark{
    background-color: #000;
    color: #fff;
}   
.light {
    background-color: #fff;
    color: #000;
}