body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

#app {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.spritePosition {
    margin: 10px 0 0 10px;
    font-size: 0.8em;
}

.button {
    width: 140px;
    margin: 10px;
    padding: 10px;
    background-color: #000000;
    color: rgba(255, 255, 255, 0.87);
    border: 1px solid rgba(255, 255, 255, 0.87);
    cursor: pointer;
    transition: all 0.3s;

    &:hover {
        border: 1px solid #0ec3c9;
        color: #0ec3c9;
    }

    &:active {
        background-color: #0ec3c9;
    }

    /* Disabled styles */
    &:disabled {
        cursor: not-allowed;
        border: 1px solid rgba(255, 255, 255, 0.3);
        color: rgba(255, 255, 255, 0.3);
    }
}

#game-container {
  position: absolute;
}

.stars {
  height: 15px;
  width: 15px;
  border-radius: 50%;
  animation-iteration-count: infinite;
}

.star-1 {
  height: 12px;
  width: 12px;
  background-color: #528295;
  animation-name: twinkle-1;
  animation-duration: 4s;
  opacity: 0.7;
}

.star-2 {
  height: 13px;
  width: 13px;
  background-color: #65a2bb;
  animation-name: twinkle-2;
  animation-duration: 5s;
  opacity: 0.8;
}

.star-3 {
  height: 8px;
  width: 8px;
  background-color: #406472;
  animation-name: twinkle-3;
  animation-duration: 6s;
  opacity: 0.75;
}

.star-4 {
  height: 11px;
  width: 11px;
  background-color: #6aaac4;
  animation-name: twinkle-4;
  animation-duration: 4s;
  opacity: 0.7;
}

@keyframes twinkle-1 {
  50% {
    transform: scale(0.4);
    opacity: 0.4;
  }
}

@keyframes twinkle-2 {
  20% {
    transform: scale(0.4);
    opacity: 0.3;
  }
}

@keyframes twinkle-3 {
  40% {
    transform: scale(0.4);
    opacity: 0.35;
  }
}

@keyframes twinkle-4 {
  50% {
    transform: scale(0.3);
    opacity: 0.3;
  }
}