body {
  background-image: url('https://media.istockphoto.com/id/1147686050/photo/paper-texture-on-white-color-background.jpg?s=612x612&w=0&k=20&c=7VMnfwqRItsWjlwyN_-YlbhQogMfWInwZCCKIK0a0yg=');
  background-size: cover;
  background-repeat: repeat;
  background-position: center bottom;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 75vh;
}

.board button {
  width: 100px;
  height: 100px;
  background-color: gray;
  border-radius: 50%;
  border: 4px solid black;
  margin: 1px;
}