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HTML 

              
                <body class="align">

  <div class="color-container">

    <h2>Choose a color pattern!</h2>

    <div class="color-palettes">

      <div class="color-palette">

        <h3>Strawberry</h3>

        <div class="colors">
          <span class="color c73102a"></span>
          <span class="color ca6386b"></span>
          <span class="color c3b574b"></span>
          <span class="color c15bf5f"></span>
          <span class="color c62bf54"></span>
        </div>

      </div>

      <div class="color-palette">

        <h3>Orange</h3>

        <div class="colors">
          <span class="color ce8b830"></span>
          <span class="color ce48831"></span>
          <span class="color cd84c35"></span>
          <span class="color c9e3c2f"></span>
        </div>

      </div>

      <div class="color-palette">

        <h3>Winter</h3>

        <div class="colors">
          <span class="color c020c17"></span>
          <span class="color c021325"></span>
          <span class="color c00353d"></span>
          <span class="color c006063"></span>
          <span class="color c018687"></span>
        </div>

      </div>

      <div class="color-palette">

        <h3>Retro</h3>

        <div class="colors">
          <span class="color cadcd37"></span>
          <span class="color cfa5735"></span>
          <span class="color c37ac72"></span>
        </div>

      </div>

    </div>

  </div>

</body>
!

CSS 

              
                @use postcss-preset-env {
  stage: 0;
}

/* ---------- GENERAL ---------- */

* {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}

body {
	background-color: #cbd0d4;
  font-family: Open Sans, sans-serif;
  line-height: 1.5;
	margin: 0;
  min-block-size: 100vh;
  padding: 10vmin;
}

h2,
h3 {
	margin: 0;
	font: inherit;
}

.align {
  display: grid;
  place-items: center;
}

/* ---------- COLOR-PALETTE ---------- */

.color-container {
	background-color: #1c252e;
	border-radius: 5px;
	padding: 32px;
	position: relative;
	width: 16em;
}

.color-container:before {
	background: #1c252e;
	content: "";
	height: 8px;
	left: 50%;
	margin: -4px 0 0 -4px;
	position: absolute;
	top: 0;
	transform: rotate(45deg);
	width: 8px;
}

.color-container h2 {
	color: #9aa1a7;
	font-size: 16px;
  margin-bottom: 21px;
}

.color-palettes {
	display: grid;
  gap: 1.5em;
}

.color-palette h3 {
	color: #9aa1a7;
	font-size: 14px;
	margin-bottom: 8px;
}

.colors {
  display: flex;
  height: 24px;
}

.color {
  width: 100%;
}

.color:first-of-type {
  border-bottom-left-radius: 3px;
  border-top-left-radius: 3px;
}

.color:last-of-type {
	border-bottom-right-radius: 3px;
  border-top-right-radius: 3px;
}

/* STRAWBERRY */
.c73102a { background-color: #73102a; }
.ca6386b { background-color: #a6386b; }
.c3b574b { background-color: #3b574b; }
.c15bf5f { background-color: #15bf5f; }
.c62bf54 { background-color: #62bf54; }

/* ORANGE */
.ce8b830 { background-color: #e8b830; }
.ce48831 { background-color: #e48831; }
.cd84c35 { background-color: #d84c35; }
.c9e3c2f { background-color: #9e3c2f; }

/* WINTER */
.c020c17 { background-color: #020c17; }
.c021325 { background-color: #021325; }
.c00353d { background-color: #00353d; }
.c006063 { background-color: #006063; }
.c018687 { background-color: #018687; }

/* RETRO */
.cadcd37 { background-color: #adcd37; }
.cfa5735 { background-color: #fa5735; }
.c37ac72 { background-color: #37ac72; }
!

JS
!
999px

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