HTMLify

@import "https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap";
* {
  margin: 0;
  font-family: "Poppins", "Franklin Gothic Medium", "Arial Narrow", Arial,
    sans-serif;
}
:root {
  --clr-primary: #000;
  --clr-secondary: #fff;
}
html.dark {
  --clr-primary: #fff;
  --clr-secondary: #333;
  background-color: #111;
  color: var(--clr-primary);
}
body {
  color: #000;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.toggle {
  cursor: pointer;
  background-color: var(--clr-primary);
  color: var(--clr-secondary);
  padding: 8px 12px;
  border: 0;
  border-radius: 4px;
  position: absolute;
  top: 100px;
}
.clock-crt {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
}
.clock {
  position: relative;
  width: 200px;
  height: 200px;
}
.needle {
  position: absolute;
  background-color: var(--clr-primary);
  top: 50%;
  left: 50%;
  height: 65px;
  width: 3px;
  transform-origin: bottom center;
  transition: all 0.3s ease;
}
.needle.hour {
  transform: translate(-50%, -100%) rotate(0deg);
}
.needle.minute {
  transform: translate(-50%, -100%) rotate(0deg);
  height: 100px;
}
.needle.second {
  transform: translate(-50%, -100%) rotate(0deg);
  height: 100px;
  background-color: #e74c3c;
}
.clock-center {
  position: absolute;
  background-color: #e74c3c;
  width: 10px;
  height: 10px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 100vw;
}
.clock-center::after {
  content: "";
  position: absolute;
  background-color: var(--clr-primary);
  width: 5px;
  height: 5px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 100vw;
}
.time {
  font-size: 60px;
}
html.dark .time {
  color: #fff;
}
.date {
  color: #aaa;
  font-size: 14px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.date .circle {
  background-color: var(--clr-primary);
  color: var(--clr-secondary);
  border-radius: 100vw;
  height: 18px;
  width: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 18px;
  transition: all 0.5s ease;
  font-size: 12px;
}