Some help needed with ID Selectors


#1

Okay, so the task requires me to add an ID selector for the ID "header-text", and no matter where I put the line of code in, it just won't work. Here's a segment of the code:
'''
.header {
background-image: url("https://s3.amazonaws.com/codecademy-content/courses/web-101/unit-5/htmlcss1-img_canyon.jpeg");
background-position: center center;
background-size: cover;
height: 700px;
width: 100%;
}

/* Add the ID selector to this CSS rule */

{
margin: 0 auto;
position: relative;
text-align: center;
top: 25%;
width: 60%;
}

h1 {
color: #FFF;
font-family: 'Quicksand', sans-serif;
font-size: 70px;
font-weight: 400;
line-height: 60px;
margin: 0;
}
'''

ID Selectors: CSS


#2

The above is a declaration block with no selector.

Eg.

#selector {

}