I have been searching for information on Google, and I finally worked out the solution to this. It was a little bit tricky and I feel that the statement was a little bit underexplained.
Anyway, in case that anyone gets stucked too, the answer is the following:
body {
/* background-color: burlywood; */
}
h1, h2, p {
text-align: center;
}
div {
width: 300px;
}