JSFiddle - React, Tailwind, and code Playground

by poselab

HTML

<div class="opacity">
  opacity
</div>

<div class="rgba background">
  rgba background
</div>

<div class="rgba color">
  rgba color
</div>

CSS

.opacity {
  /* opacidad del elemento 0.3 */
  opacity: 0.3;
  background: black;
  color: red;
}

.rgba.background {
  /* opacidad del color de fondo 0.3 */
  background: rgba(0, 0, 0, 0.3);
  color: red;
}

.rgba.color {
  /* opacidad del color de texto 0.3 */
  color: rgba(255, 0, 0, 0.3);
  background: black;
}

div {
  padding: 10px;
  margin-bottom: 5px;
}