html {
  background-color: #757575;
}

body {
  margin: 0;
  height: 100vh;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
}

.clock {
  max-width: 98vmin;
  max-height: 98vmin;
  margin: 1vmin auto;
  padding: 3vmin 1vmin;
  display: -webkit-box;
  display: flex;
  flex-wrap: wrap;
  -webkit-box-align: center;
          align-items: center;
  -webkit-box-pack: justify;
          justify-content: space-between;
  -webkit-box-flex: 1;
          flex: 1 1 100%;
  box-sizing: border-box;
  border: 2vmin solid #fafafa;
  box-shadow: 0 .125vmin 1vmin #212121, inset 0 0 .5vmin #000;
  font-family: Raleway, monospace;
  font-size: 7.25vmin;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: 0.0625em;
  text-transform: uppercase;
  text-shadow: 0 0 0.125em #000, 0 0 0.25em rgba(245, 245, 245, 0.5);
  color: #f5f5f5;
  background-color: #212121;
}

.clock__span {
  display: inline-block;
  padding: 0 3vmin .125em;
  opacity: .05;
  -webkit-transition: opacity 1.5s;
  transition: opacity 1.5s;
}
.clock__span.is-lit {
  opacity: 1;
}

[data-active-hour~="1"] [data-hour="1"] {
  opacity: 1 !important;
}

[data-active-hour~="2"] [data-hour="2"] {
  opacity: 1 !important;
}

[data-active-hour~="3"] [data-hour="3"] {
  opacity: 1 !important;
}

[data-active-hour~="4"] [data-hour="4"] {
  opacity: 1 !important;
}

[data-active-hour~="5"] [data-hour="5"] {
  opacity: 1 !important;
}

[data-active-hour~="6"] [data-hour="6"] {
  opacity: 1 !important;
}

[data-active-hour~="7"] [data-hour="7"] {
  opacity: 1 !important;
}

[data-active-hour~="8"] [data-hour="8"] {
  opacity: 1 !important;
}

[data-active-hour~="9"] [data-hour="9"] {
  opacity: 1 !important;
}

[data-active-hour~="10"] [data-hour="10"] {
  opacity: 1 !important;
}

[data-active-hour~="11"] [data-hour="11"] {
  opacity: 1 !important;
}

[data-active-hour~="12"] [data-hour="12"] {
  opacity: 1 !important;
}

[data-active-minutes~="five"] [data-minutes="five"] {
  opacity: 1 !important;
}

[data-active-minutes~="ten"] [data-minutes="ten"] {
  opacity: 1 !important;
}

[data-active-minutes~="quarter"] [data-minutes="quarter"] {
  opacity: 1 !important;
}

[data-active-minutes~="twenty"] [data-minutes="twenty"] {
  opacity: 1 !important;
}

[data-active-minutes~="half"] [data-minutes="half"] {
  opacity: 1 !important;
}

[data-active-modifier~="minutes"] [data-modifier="minutes"] {
  opacity: 1 !important;
}

[data-active-modifier~="to"] [data-modifier="to"] {
  opacity: 1 !important;
}

[data-active-modifier~="past"] [data-modifier="past"] {
  opacity: 1 !important;
}

[data-active-modifier~="oclock"] [data-modifier="oclock"] {
  opacity: 1 !important;
}