* {
    margin: 0;
    padding: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

:root {
    font-size: calc(100vw / 7.5);
}

html,
body {
    width: 100%;
    height: 100%;
}

body {
    display: -webkit-box;
    display: flex;
    -webkit-box-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    align-items: center;
    background-color: #111;
    overflow: hidden;
    touch-action: none;
}

.long-shadow {
    display: -webkit-box;
    display: flex;
    -webkit-box-pack: justify;
    justify-content: space-between;
    -webkit-box-align: center;
    align-items: center;
    position: relative;
    z-index: 1;
    width: 5rem;
    height: 0.8rem;
}

.letter {
    display: -webkit-inline-box;
    display: inline-flex;
    -webkit-box-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    align-items: center;
    width: 0.4rem;
    height: 0.4rem;
    border-radius: 0.02rem;
    background: linear-gradient(-25deg, #1e3c72, #2a5298);
    cursor: pointer;
    overflow: hidden;
}

.letter::after {
    content: attr(data-letter);
    font-size: 0.25rem;
    color: #a8a8a8;
    font-family: Arial, Helvetica, sans-serif;
}

.letter.enter::after {
    color: #f8f8f8;
    text-shadow: none;
    -webkit-transform: scale(0.95);
    transform: scale(0.95);
}

.letter.transition-activity::after {
    -webkit-transition: text-shadow 0.2s ease-out, color 0.2s ease-out, -webkit-transform 0.2s ease-out;
    transition: text-shadow 0.2s ease-out, color 0.2s ease-out, -webkit-transform 0.2s ease-out;
    transition: text-shadow 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out;
    transition: text-shadow 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out, -webkit-transform 0.2s ease-out;
}

.light-source {
    position: absolute;
    display: -webkit-box;
    display: flex;
    width: 100%;
    height: 100%;
    -webkit-perspective: 0.5rem;
    perspective: 0.5rem;
    -webkit-transform: translate3d(0, -50%, 0) rotateZ(90deg);
    transform: translate3d(0, -50%, 0) rotateZ(90deg);
    -webkit-transform-origin: center;
    transform-origin: center;
}

.light {
    margin: auto;
    width: 1rem;
    height: 0.2rem;
    -webkit-transform: rotateY(-85deg);
    transform: rotateY(-85deg);
    -webkit-transform-origin: center;
    transform-origin: center;
    background-image: -webkit-gradient(linear, left top, right top, color-stop(50%, #fff), to(transparent));
    background-image: linear-gradient(to right, #fff 50%, transparent);
}