example.css

.toast {
  --base-toast-color: hsl(226, 87%, 56%);

  color: oklch(from var(--toast-color) 25% c h);
  border: 2px solid var(--toast-color);
  background: oklch(from var(--toast-color) 90% calc(c / 2) h);
  box-shadow: 0 12px 12px -8px oklch(from var(--toast-color) l c h / 0.325);
}
.oklch {
  [data-toast="info"] {
    --toast-color: oklch(from var(--base-toast-color) l c 275);
  }
  [data-toast="warning"] {
    --toast-color: oklch(from var(--base-toast-color) l c 80);
  }
  [data-toast="error"] {
    --toast-color: oklch(from var(--base-toast-color) l c 35);
  }
}

.hsl {
  [data-toast="info"] {
    --toast-color: hsl(from var(--base-toast-color) 240 s l);
  }
  [data-toast="warning"] {
    --toast-color: hsl(from var(--base-toast-color) 35 s l);
  }
  [data-toast="error"] {
    --toast-color: hsl(from var(--base-toast-color) 0 s l);
  }
}

.toast-grid {
  display: grid;
  gap: 2rem;
  max-inline-size: 400px;
  margin-inline: auto;
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: 12px;
  margin-block-end: 1rem;
}

.toast {
  border-radius: 8px;
  padding: 8px 24px;
  inline-size: fit-content;
  margin-inline: auto;
}

body {
  font-family: system-ui;
  text-align: center;
}

h2 {
  margin: 0;
  font-size: 1rem;
}

example.html

<!-- https://codepen.io/kevinpowell/pen/wBMbozYhttps://codepen.io/kevinpowell/pen/wBMbozY -->

<!--
oklch maji lepsi vnimani barev a lepe pracuji s posunem barev ..
-->

<div class="toast-grid oklch">
  <h2>using oklch</h2>
  <div class="toast" data-toast="info">Some general info toast</div>
  <div class="toast" data-toast="warning">This might end badly</div>
  <div class="toast" data-toast="error">Oh no, something has gone wrong!</div>
</div>

<div class="toast-grid hsl">
  <h2>using hsl</h2>
  <div class="toast" data-toast="info">Some general info toast</div>
  <div class="toast" data-toast="warning">This might end badly</div>
  <div class="toast" data-toast="error">Oh no, something has gone wrong!</div>
</div>