style.css

* {
  -webkit-touch-callout: none;
  /* iOS Safari */
  -webkit-user-select: none;
  /* Safari */
  -khtml-user-select: none;
  /* Konqueror HTML */
  -moz-user-select: none;
  /* Old versions of Firefox */
  -ms-user-select: none;
  /* Internet Explorer/Edge */
  user-select: none;
  /* Non-prefixed version, currently
                                  supported by Chrome, Edge, Opera and Firefox */
}

body {
  height: 100vh;
  width: 100vw;
  background-color: black;
  color: white;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

#app {
  display: flex;
  justify-content: center;
  align-items: center;
}

#title {
  text-align: center;
  text-decoration: underline;
}

#app> :not(:first-child) {
  margin-left: 1vw;
}

#gameboard {
  background-color: #cccccc;
  width: 100vmin;
  height: 90vmin;
  display: grid;
  grid-template-rows: repeat(25, 1fr);
  grid-template-columns: repeat(25, 1fr);
}

.snake {
  background-color: hsl(200, 100%, 50%);
  border: .25vmin solid black;
}

.apple {
  width: 1vmin;
  height: 1vmin;
  border-radius: 50%;
  background-color: crimson;
  border: .25vmin solid black;
  margin: 1.2vmin;
}

.bug {
  background-color: grey;
  border: .25vmin solid black;
  display: flex;
  justify-content: center;
  align-items: center;
}

.wrong {
  text-decoration: line-through;
}

#victory {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#victory>* {
  font-size: 5vw;
  line-height: 1vw;
}

#victory>img {
  width: 50%;
  height: 80%;
}