html, body {
  margin: 0;
  padding: 0;
}

body {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  height: 100vh;
  width: 100vw;
  min-width: 400px;
  padding: 60px;
  background-color:black;

}

canvas {
   display: block;
  border: 10px solid rgb(0, 233, 153);
  border-radius: 35px;
  width: 50%;
  height: 50px;
}