The outline-color
property defines the color of an outline.
outline-color: invert | value;
.div-1 , .div-2{
margin-right: 10px;
outline-style: solid;
}
.div-1 {
outline-color: invert;
}
.div-2 {
outline-color: red;
}
invert: makes sure the outline is visible.
value: sets the given color value as the color of outline.