.game-container{position:relative;width:100%;height:100vh;background-color:#add8e6}.game-area{position:relative;width:100%;height:100%}.obstacle{position:absolute;background-color:red;width:30px;height:30px}.boat{position:absolute;background-color:#00f;width:50px;height:50px;bottom:10px;left:50%;transform:translate(-50%)}.game-over{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:24px;color:red}