body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #222;
  margin: 0;
  overflow: hidden;
  font-family: sans-serif;
}

#game-container {
  position: relative; 
  border: 2px solid #fff;
  background-color: #000; 
}

.tile {
  position: absolute;
  width: 40px;
  height: 40px;
  box-sizing: border-box;
}

.tile.grass {
  background-color: #0a4000; 
  border: 1px solid #1a500a;
}

.tile.wall {
  background-color: #404040; 
  border: 1px solid #505050;
}

#player {
  position: absolute;
  z-index: 1; 
  transition: left 0.1s linear, top 0.1s linear; 
  display: flex; 
  justify-content: center;
  align-items: center;
}

#player img {
}