html {
    margin: 0;
    padding: 0;
}
body {
    height: 100vh;
    width: 100vw;
    background: url(img/wish.jpg) no-repeat;
    background-size: cover;
    background-position: center center;  
    overflow: hidden;
    display: flex;
    align-items: stretch;
    flex-direction: column;
    color: #000;
    font-family: "Helvetica", sans-serif;
    font-size: 5vh;
    position: relative;
    margin: 0;
    padding: 0;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
main p {
    font-size: 1.25rem;
    text-align: center;
    margin-top: 5vh;
    padding: 0 2rem;
    max-width: 30rem;
    line-height: 1.4;
}

footer {
    height: 5vh;
    line-height: 5vh;
    font-size: 3vh;
    background: #000;
    text-align: right;
    text-transform: uppercase;
    padding: 0 2.5vh;
}
footer ul {
    display: flex;
    flex-direction: row-reverse;
    position: fixed;
    bottom: -50px;
    left: -20px;
}
footer ul .misses {
    padding: 0.5vh;
    transition: all 0.225s ease-out;
}
footer ul .misses.missed {
    opacity: 0.4;
    transform: rotate(-45deg);
}
footer li {
    list-style: none;
    color: #fff;
}
main > div {
    position: absolute;
    top: 5vh;
    left: 0;
    text-transform: uppercase;
    perspective: 300px;
    transition: opacity 0.7s ease-in;
    font-size: 5vh;
}
main > div.popped {
    opacity: 0;
}
main > div.popped > span {
    animation-play-state: paused;
}
main > div.popped > span b {
    opacity: 0;
}
main > div.missed {
    opacity: 0;
}
main > div.missed > span {
    animation-play-state: paused;
}
main > div > span {
    position: absolute;
    display: block;
    animation: waver 2s infinite alternate ease-in-out;
    perspective: 300px;
}
main > div > span b {
    display: block;
    padding: 2.5vh;
    transition: opacity 0.25s linear;
}

@keyframes waver {
  100% {
    transform: translate3d(6vw, 0, 0);
  }
}
#game-over {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.75s ease-out;
    background: rgba(0, 0, 0, 0.75);
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-transform: uppercase;
    color: #fff;
}
#game-over.indeed {
    opacity: 1;
    pointer-events: auto;
}
#score {
    color: #fff;
}
button {
    appearance: none;
    border-radius: 0;
    border: 0.3rem solid #000;
    color: #000;
    font-size: 3vh;
    padding: 1.5vh 2vh;
    background: transparent;
    margin-top: 5vh;
}
button:hover {
    border-color: #fff;
    color: #fff;
    cursor: pointer;
}