body{
  background-color: #f9f9f9;
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
}

main{
    width: 100vw;
    height: 100vh;
    background-image: url(../img/lake-ontario.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    display: block;
    background-position: center center;
    padding: 0;
    margin: 0;
}