body {
  height: 100%;
  overflow: hidden;
  font: 16px sans-serif;
  color: rgb(105, 155, 58);
  background-color: rgb(49, 49, 49);
}

.wrap {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.game-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.main {
  width: 800px;
  height: 600px;
  background: url(img/space.gif);
  animation: scroll-background 5s linear infinite;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: -2;
}

header {
  text-align: center;
  background: black;
  color: #fff;
  padding: 10px;
}

footer {
  padding: 10px;
  text-align: center;
  font-size: 11px;
  background: black;
  color: white;
}

@keyframes scroll-background {
  from {
    background-position-y: 0px;
  }
  to {
    background-position-y: 256px;
  }
}

.wrap {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.main .laser {
  position: absolute;
  margin-left: -2.5px;
  height: 25px;
  /* default z-index is 0*/
  z-index: -1;
}

.main .enemy{
  position: absolute;
}

.main .enemyLaser {
  position: absolute;
  margin-left: -2.5px;
  height: 20px;
  /* default z-index is 0*/
  z-index: -1;
}

 .lose {
  display: none;
  position: absolute;
  background: #6b1818;
  color: white;
  padding: 20px 50px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  text-align: center;
  animation: pop-in 1s;
}

.win  {
  display: none;
  position: absolute;
  background: #05c04d;
  color: white;
  padding: 20px 50px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  text-align: center;
  animation: pop-in 1s;