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body {
  margin: 1em auto;
  max-width: 40em;
  width: 88%;
/* The CSS aspect-ratio property tells browsers to preserve a specific aspect ratio on an element when scaling the size of it up or down. */

iframe {
    width: 100%;
    height: 100%;
    aspect-ratio: 16 / 9;

<iframe width="560" height="315" src="" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
CSS custom properties are excellent when it comes to updating multiple elements at once. By injecting a --text-multiplier variable into the text elements' size, you can increase/decrease them all at a specific breakpoint by editing the variable.

// Method 3
h1 {
  font-size: calc(2em * var(--text-multiplier, 1));

p {
  font-size: calc(1em * var(--text-multiplier, 1));

@media (min-width: 48rem) {
  :root {
    --text-multiplier: 1.25;

Wed Feb 23 2022 17:58:25 GMT+0000 (UTC)

#html #css #iframe #responsive

Fri Oct 02 2020 02:30:15 GMT+0000 (UTC)

#tipografia #responsive

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