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

.koty {
    color: blue;
}

.auta {
    color: red;
    font-weight: bold;
}

.drzewa {
    color: green;
    font-style: oblique;
}

.prod1 {
    color: blue;
}

.prod2 {
    color: red;
}

.prod3 {
    color: green;
}