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<h1 class="speed">
  <span class="speed-value">0</span>
  <span class="units">KM/H</span>
</h1>
html {
  font-size: 100px;
}
body {
  margin: 0;
  font-family: sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background: radial-gradient(black 15%, transparent 16%) 0 0,
    radial-gradient(black 15%, transparent 16%) 8px 8px,
    radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 0 1px,
    radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 8px 9px;
  background-color: #282828;
  background-size: 16px 16px;
  background-attachment: fixed;
}

.arrow {
  width: 250px;
  overflow: hidden;
  transition: all 0.2s;
  transform: rotate(0deg);
  display: inline-block;
}

h1 {
  color: white;
  font-weight: 100;
  font-size: 60px;
  display: flex;
  align-items: center;
}

.units {
  font-size: 15px;
}
const arrow = document.querySelector('.arrow');
    const speed = document.querySelector('.speed-value');

    navigator.geolocation.watchPosition((data) => {
      console.log(data);
      speed.textContent = data.coords.speed;
      arrow.style.transform = `rotate(${data.coords.heading}deg)`;
    }, (err) => {
      console.error(err);
    });

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.