* {
    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;
}