body{
  text-align: center;
}
body > *{
  margin: 0 auto;
}
h1{
  margin: 15px;
}
canvas{
  border: solid 1px #aaa;
}

#productsTopButton{
  width: 100px;
  height: 30px;
  line-height: 30px;
  border-radius: 5px;
  background: #f0f2ff;
  display: block;
  text-align: center;
  margin: 5px auto;
  text-decoration: none;
  color: #222;
  font-weight: bold;
  box-shadow: 1px 1px 2px 2px;
}
#productsTopButton:hover{
  box-shadow: 2px 2px 2px 2px inset;
}