how to create a snake game in html css js

body {
  background: rgb(212, 211, 211);
}

.grid {
  width: 200px;
  height: 200px;
  border: 1px solid red;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
}

.grid div {
  width: 20px;
  height: 20px;
  /*border:1px black solid;
box-sizing:border-box*/
}

.snake {
  background: blue;
}

.apple {
  background: yellow;
  border-radius: 20px;
}

.popup {
  background: rgb(32, 31, 31);
  width: 100px;
  height: 100px;
  position: fixed;
  top: 100px;
  left: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
}