*{
    margin : 0;
    padding : 0;
    box-sizing: border-box;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    margin: auto;
    height: 100vh;
    width: auto;
    color: #7777eb;
}

#gameContainer {
  position: relative;
  margin: 0 auto;
}

#restartBtn {
  position: absolute;
  top: 55%;
  left: 55%;
  transform: translate(-50%, -50%);
  padding: 12px 24px;
  font-size: 18px;
  font-weight: bold;
  background-color: #ff4d4f;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  transition: 0.2s ease-in-out;
}

#restartBtn:hover {
  background-color: #e03c3f;
}