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About the <head>

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HTML 

              
                <div class="dice">
  <div class="face">
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
  </div>
  <div class="face">
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
  </div>
  <div class="face">
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
  </div>
  <div class="face">
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
  </div>
  <div class="face">
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
  </div>
  <div class="face">
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
    <div class="row">
      <div class="dot"></div>
      <div class="dot"></div>
      <div class="dot"></div>
    </div>
  </div>
</div>
!

CSS 

              
                body {
  height: 100vh;
  margin: 0;
  background-color: #000; /* hex code for black */
  font-size: .8vmin; /* it's not for text, it's for using the font-size unit of 'em' for sizing containers */
  place-items: center; /* centers the content vertically and horizontally*/
}

body, .dice {
  display: grid; /* on the body it's for centering items, on the others it's for setting up grid rows and columns */
}

.dice {
  grid-template-columns: repeat(3, 1fr); /* three even columns */
  grid-template-rows: repeat(2, 1fr); /* two even rows */
}

.face, .row {
  display: flex; /* only these will require flex for our purposes */
}

.face {
  flex-direction: column; /* arranging the sets of 3 dots into a stack of 3 rows*/
  background-color: hsl(calc(60deg*var(--step)) 100% 50%);
  grid-template-rows: repeat(3, 1fr); /* three even rows */
  grid-template-columns: repeat(3, 1fr); /* three even columns */
  width: 30em;
  aspect-ratio: 1; /* height equals width */
  margin: 30px;
  position: relative; /* this makes .face the point of reference for its children */
  
}

.row {
  position: relative; /* this makes .face the point of reference for its children */
  aspect-ratio: 3; /* the width is 100% of the .dice's width, the height is a third of that  */
}

.face:nth-child(1) { --step: 0; }
.face:nth-child(2) { --step: 1; }
.face:nth-child(3) { --step: 2; }
.face:nth-child(4) { --step: 3; }
.face:nth-child(5) { --step: 4; }
.face:nth-child(6) { --step: 5; }

.dot {
  aspect-ratio: 1; /* the height is 100% of the .row's height (which is a third of the .face's height); this makes .dot a square that is a third of the .face's length and width */
  background-image: radial-gradient(#fff 25%, #fff0 0); /* creating a small dot in the middle of the square using gradients (but there are other ways to do this) */
  mix-blend-mode: difference;
}
!

JS 

              
                /*
Check out my blog:
https://mackfitz.hashnode.dev/laying-out-dots-on-a-dice-using-displayflex-pseudo-classes
for a tutorial on how to make these six display one, two, three, four, five and six faces - as a dice would - using display:flex
*/
!
999px

Console