*, *::after, *::before {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-image: url(images/background.png);
    background-size: cover;
    font-family: "Lato", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";    overflow: hidden;
}

.title {
    z-index: 10;
    position: absolute;
    display: flex;
    text-align: center;
    justify-content: center;
    align-items: center;
    inset: 0;
    margin: 0;
    flex-direction: column;
}

.subtitle {
    margin-top: .5rem;
}

.hide {
    display: none;
}

.bird {
    --bird-top: -1000;
    --bird-size: 60px;
    position: absolute;
    width: var(--bird-size);
    left: var(--bird-size);
    top: calc(var(--bird-top) * 1px);
    border-radius: 50%;
}

.pipe {
    position: absolute;
    top: 0;
    bottom: 0;
    width: calc(var(--pipe-width) * 1px);
    left: calc(var(--pipe-left) * 1px);
}

.pipe > .segment {
    position: absolute;
    width: 100%;
    background-size: 100% 600px;
}

.pipe > .top {
    top: 0;
    bottom: calc(var(--hole-top) * 1px);
    background-image: url(images/topPipe.png);
    background-position: bottom;
}

.pipe > .bottom {
    bottom: 0;
    top: calc(100vh - (var(--hole-top) * 1px) + calc(var(--hole-height) * 1px));    
    background-image: url(images/bottomPipe.png);
}