css-exercises/foundations/03-grouping-selectors/style.css

.first, 
.second { 
    font-family: Helvetica, 'Times New Roman', sans-serif;
    font-size: 28px;
}       

.first {
    background-color: black;
    color: white;
    font-weight: bold;
}

.second {
    background-color: yellow;
}