style.css

body {
  font-size: 30px;
  margin: 2rem;
  display: flex;
}

.container--01 {
  flex-grow: 1;
}

.container--02 {
  flex-grow: 2;
}

.container {
  contain: style layout inline-size;
}

.content {
  display: flex;
  height: 300px;
}

.box {
  background-color: yellow;
  border: 3px solid black;
  min-height: 1rem;
  flex-grow: 1;
  margin: .25rem;
  padding: .5rem;
}

@container (max-width: 800px) {
  .content {
    flex-direction: column;
  }
  .box {
    background-color: orange;
  }
}

/* .container:before {
    content: attr(data-size);
    position: absolute;
    left: 0;
    right: 0;
    top: -0.6rem;
    width: 6ch;
    margin: 0 auto;
    text-align: center;
    display: inline-block;
    background: black;
    color: white;
} */
/*# sourceMappingURL=style.css.map */