body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: darkgray;
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

#ground {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: black;
}

#player {
    position: absolute;
    bottom: 100px;
    left: 100px;
    width: 50px;
    height: 50px;
    background: red;
}

.obstacle {
    position: absolute;
    width: 50px;  
    height: 50px;
    background: green;
    bottom: 100px;
    right: 0;
}

#popup {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  display: none;           /* hidden until needed */
  justify-content: center;
  align-items: center;
  z-index: 10;
}

#popup-content {
  background: white;
  padding: 20px 40px;
  border-radius: 10px;
  text-align: center;
}

#popup h1 {
  margin: 0 0 20px;
}

#scoreboard {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 24px;
    font-family: Arial, sans-serif;
    color: black;
    z-index: 100;
}