* { font-style: italic; }

div {
    border: 1px solid black;
    width: 20%;
}
div p { margin: 1px; }

#pares :nth-child(2n) { background-color: red; }

#impares :nth-child(2n+1) { background-color: green; }

#quinto :nth-child(5) { background-color: yellow; }

#raro :nth-child(3n+1) { background-color: yellow; }

table {
    background-color: lightgoldenrodyellow;
}

tr:nth-child(2n+2) {
    background-color: lightblue;
}

ul li:only-child {
    color: purple;
}

strong:only-of-type {
    color: green;
}

input:enabled + span {
    color: green;
}

input:disabled + span {
    color: gray;
}