* {
  margin: 0px;
  padding: 0px;
}
body { 
  background-color: lightgray;
  font-family: Arial, Helvetica, sans-serif;
}
#container {
  width: 1100px;
  margin: 0px auto;
  border; 4px solid gray;
}
hearder {
  background-color: red;
  height: 100px;
  width: 100%;
  margin: 0px;
  text-align: center;
line-height: 100px;
color: antiquewhite;
border-bottom: 2px solid black;