body {
  padding: 0px;
}
.myblock {
  display: block;
  background-color: red;
  height: 10px;
}
.product {
  display: block;
  height: 200px;
  background-color: yellow;
  margin-bottom: 20px;
}
#nav {
  position: fixed;
  left: 10px;
  top: 10px;
}
#completeImage {
  width: 100%;
  height: 900px;
  display: block;
  background: linear-gradient(63deg, #999999 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #999999 78%), linear-gradient(63deg, transparent 34%, #999999 38%, #999999 58%, transparent 62%), #444444;
  background-size: 16px 48px;
}