Text alignment is used to position text on the left (default), centre, on the right, or justified (stretched so it is straight on both margins).

Note that “center” uses the American spelling.

h1, h2 {
    text-align: center;
}

p {
    text-align: left;
}

p.quotation {
    text-align: justify;
}

p.author {
    text-align: right;
}