speedtest-go/web/assets/styling/results.css

/* Variables */

:root {
  --gauge-width: 32rem;
  --gauge-height: 22rem;
  --progress-width: 0.6rem;
  --speed-width: 3rem;
}

/* Layout for the gauges */

.gauge-layout {
  display: flex;
  flex-direction: row;
  align-items: start;
  justify-content: center;
  gap: 5rem;
  margin: 5rem auto 3rem auto;

  @media screen and (max-width: 1100px) {
    display: grid;
    grid-template-areas:
      "download upload"
      "ping jitter";
    justify-items: center;
    justify-content: center;

    --gauge-width: min(40vw, 32rem);
    --gauge-height: min(28vw, 22rem);
    --progress-width: min(1.2vw, 0.6rem);
    --speed-width: min(4vw, 3rem);
  }
  @media screen and (max-width: 500px) {
    gap: 5rem 2rem;
  }
}

/* The download/upload speed gauges */

/**
 * One thing I should really document here is the weird `transform: scale(1);`
 * and `position: fixed` in this code. This is a nasty little trick to allow the
 * gauge pointer to break out of the `overflow: hidden` of the .speed element.
 * We need the `overflow: hidden` to hide the arc that's rotating into view when
 * the value goes up. But we do want to see the full pointer, even when it's at
 * zero. This degrades fairly gracefully into showing half of the pointer when
 * browsers don't understand this.
 *
 * Trick taken from this article:
 * https://medium.com/@thomas.ryu/css-overriding-the-parents-overflow-hidden-90c75a0e7296
 */

div.gauge {
  position: relative;
  transform: scale(1);
  width: var(--gauge-width);
  height: var(--gauge-height);

  &.download {
    grid-area: download;
  }
  &.upload {
    grid-area: upload;
  }

  & > .progress,
  & > .speed {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--gauge-width);
    height: calc(var(--gauge-width) / 2);
    overflow: hidden;

    &:after,
    &:before {
      content: "";
      position: absolute;
      box-sizing: border-box;
    }
  }

  & > .progress {
    &:before,
    &:after {
      top: 0;
      left: 0;
      width: var(--gauge-width);
      height: calc(var(--gauge-width) / 2);

      border-radius: 50% 50% 0 0 / 100% 100% 0 0;
      border: var(--progress-width) solid var(--gauge-background-color);
      border-bottom: 0;

      transform-origin: bottom center;
      transform: rotate(var(--progress-rotation));
      transition: transform 0.2s linear;
    }
    &:after {
      top: calc(var(--gauge-width) / 2);

      border-radius: 0 0 50% 50% / 0 0 100% 100%;
      border: var(--progress-width) solid var(--gauge-background-color);
      border-top: 0;

      transform-origin: top center;
    }
  }

  & > .speed {
    &:before,
    &:after {
      transform: rotate(var(--speed-rotation));
      transition: transform 0.2s ease;
      transition-timing-function: cubic-bezier(0.56, 0.04, 0.59, 0.91);
    }
    &:before {
      position: fixed;
      top: calc(var(--gauge-width) / 2 - var(--speed-width) / 3);
      left: var(--progress-width);
      width: 0;
      height: 0;

      border-top: calc(var(--speed-width) / 3) solid transparent;
      border-bottom: calc(var(--speed-width) / 3) solid transparent;
      border-right: calc(var(--speed-width) * 0.97) solid
        var(--gauge-background-color);
      z-index: 1;

      transform-origin: calc(var(--gauge-width) / 2 - var(--progress-width))
        calc(var(--speed-width) / 3);
    }
    &:after {
      top: calc(var(--gauge-width) / 2);
      left: calc(var(--progress-width) - 0.1rem);
      width: calc(var(--gauge-width) - var(--progress-width) * 2 + 0.2rem);
      height: calc(var(--gauge-width) / 2 - var(--progress-width) + 0.1rem);

      border-radius: 0 0 50% 50% / 0 0 100% 100%;
      border: var(--speed-width) solid var(--gauge-background-color);
      border-top: 0;

      transform-origin: top center;
    }
  }

  &.enabled {
    &.download {
      & > .progress:after {
        border-color: var(--theme-pink);
      }
      & > .speed {
        &:before {
          border-right-color: var(--gauge-pointer-pink);
        }
        &:after {
          border-color: var(--theme-pink);
        }
      }
    }
    &.upload {
      & > .progress:after {
        border-color: var(--theme-green);
      }
      & > .speed {
        &:before {
          border-right-color: var(--gauge-pointer-green);
        }
        &:after {
          border-color: var(--theme-green);
        }
      }
    }
    & > h1 > span {
      color: var(--primary-text-color);
    }
  }

  & > h1,
  & > h2 {
    display: block;
    position: absolute;
    width: 100%;
    font-family: "Inter", sans-serif;
    font-size: 2.1rem;
    letter-spacing: -0.1rem;
    color: var(--secondary-text-color);
  }
  & > h1 {
    bottom: calc(var(--gauge-height) - var(--gauge-width) / 2);
    font-weight: 300;

    & > span {
      font-size: 5.5rem;
      font-weight: 200;
      display: block;
      color: var(--secondary-text-color);
      letter-spacing: -0.3rem;
    }
  }
  & > h2 {
    bottom: 0;
    font-weight: 700;
    text-transform: uppercase;
  }

  @media screen and (max-width: 500px) {
    & > h1 {
      font-size: 3vw;

      & > span {
        font-size: 8vw;
      }
    }

    & > h2 {
      font-size: 3vw;
    }
  }
}

/* Styling for Ping and Jitter */

.ping,
.jitter {
  grid-area: jitter;
  display: flex;
  align-items: end;
  height: calc(var(--gauge-width) / 2);
  width: 13rem;

  font-size: 2.1rem;
  letter-spacing: -0.1rem;
  font-weight: 300;
  color: var(--ping-and-jitter-secondary-text-color);

  & > .label {
    font-weight: 700;
  }
  & > .value {
    color: var(--ping-and-jitter-primary-text-color);
  }

  &.hidden {
    display: none;
  }

  @media screen and (max-width: 1100px) {
    width: 100%;
    height: auto;
    justify-content: center !important;
  }
  @media screen and (max-width: 500px) {
    font-size: 1.8rem;
  }
}
.ping {
  grid-area: ping;
  justify-content: end;
}