Structural Styles Go to the Structural Styles section. Within that section create a style rule to set the background color of the browser window to rgb(151, 151, 151).
Create a style rule to set the background color of the page body to rgb(180, 180, 223) and set the body text to the font stack: Verdana, Geneva, sans-serif.
Display all h1 and h2 headings with normal weight.
Create a style rule for every hypertext link nested within a navigation list that removes underlining from the text.
Create a style rule for the footer element that sets the text color to white and the background color to rgb(101, 101, 101). Set the font size to 0.8em. Horizontally center the footer text, and set the top/bottom padding space to 1 pixel.

Solution :

For Structural Styles the browser's background color.  

html {

background-color: rgb(151, 151, 151);

}

For creating style rule for the background color and setting the body text

body {

background-color: rgb(180,180,223);

font-family: Verdana, Geneva, sans-serif;  

}

For displaying all the h1 as well as h2 headings with the normal weight.

h1, h2 {

font-weight: normal;

}

For create the style rule for all the hypertext link that is nested within the  navigation list  

nav a {

text-decoration: none;

}

For creating style rule for footer element which sets the color of the text to color white and the color of the background to as rgb(101, 101, 101). Also setting the font size to 0.8em. Placing the footer text to horizontally center , and setting the top/bottom of the padding space to 1 pixel.

footer {

background-color: rgb(101, 101, 101);

font-size: 0.8em;

text-align: center;

color: white;

padding: 1px 0;

}

/* Structural Styles At one place*/

html {

background-color: rgb(151, 151, 151);

}

body {

background-color: rgb(180,180,223);

font-family: Verdana, Geneva, sans-serif;  

}

h1, h2 {

font-weight: normal;

}

nav a {

text-decoration: none;

}

footer {

background-color: rgb(101, 101, 101);

font-size: 0.8em;

text-align: center;

color: white;

padding: 1px 0;

}

answer; availability;