* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
#canvas1 {
  width: 1000px;
  height: 500px;
  border: 2px solid black;
  background-image: url('https://i.postimg.cc/7h8M0yJg/ocean.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
#button {
  width: 200px;
  height: 60px;
}