HTML CODE: <! DOCTYPE html > < html > < head > < title > Message Box </ title > < link rel = "stylesheet" href = "css/mountain.css" /> </ head > < div class = "loop-wrapper" > < div class = "mountain" ></ div > < div class = "hill" ></ div > < div class = "tree" ></ div > < div class = "tree" ></ div > < div class = "tree" ></ div > < div class = "rock" ></ div > < div class = "truck" ></ div > < div class = "wheels" ></ div > </ div > </ html > CSS CODE: body { background : #136482 ; overflow : hidden ; font-family : 'Open Sans' , sans-serif ; } .loop-wrapper { margin : 0 auto ; position : relative ; display : block ...