I hope you were able to solve the issue.
As I stated previously, the ccs code should be nested within the < style> < /style> elements provided at the beginning of the step. Replace the element with the h1 element in the instructions; the property with the text-align property in the instructions; and the value with the center value in the instructions.
< style>
element {
property: value;
}
< /style>
Hopefully, you are already on another step and this is just reminders of how to do it.