* {
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  flex-direction: column;
  background-color: #333;
}
#message {
    color: #fff;
    margin-top: 5%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
#game {
  width: 400px;
  height: 500px;
  border: 2px solid #000;
  margin: auto;
  overflow: hidden;
  background-color: #fff;
}
#ball {
  width: 20px;
  height: 20px;
  background-color: red;
  position: relative;
  border-radius: 50%;
  top: 400px;
  left: 190px;
  z-index: 1000000;
}
.block {
  width: 400px;
  height: 20px;
  background-color: #000;
  position: relative;
  top: 100px;
  margin-top: -20px;
}
.hole {
  width: 40px;
  height: 20px;
  background-color: #fff;
  position: relative;
  top: 100px;
  margin-top: -20px;
}