.box {
  border: thick dashed mediumvioletred;
  background: powderblue;
  background-clip: content-box;
  max-width: 60ch;
  padding: 2em;
  position: relative;

  &::after {
    content: '';
    position: absolute;
    z-index: -1;
    inset: 0;
    background: orange;
  }
}

p {
  margin: 0;
}