body.outline * {
  outline: 1px solid red;
}

body.outlineOnHover *:hover {
  outline: 1px solid #ff0000;
}

body.greenBox * {
  background-color: #22c55e36;
}
body.greenBoxOnHover *:hover {
  background-color: #22c55e36;
}

.outline {
  outline: 1px solid red;
}

.xx {
  outline: 1px solid red;
}

.xx * {
  outline: 1px solid red;
}

.xr {
  outline: 1px solid red;
}

.xg {
  outline: 1px solid green;
}

.xb {
  outline: 1px solid blue;
}