Display outlines on nested elements

element-outlines.css

:root /*or select specific element(s)*/ {
    --outline-width: .01px;
}

* {
    outline: var(--outline-width) solid red;
}

    * * {
        outline: var(--outline-width) solid green
    }

        * * * {
            outline: var(--outline-width) solid orange
        }

            * * * * {
                outline: var(--outline-width) solid blue
            }

                * * * * * {
                    outline: var(--outline-width) solid red
                }

                    * * * * * * {
                        outline: var(--outline-width) solid green
                    }

                        * * * * * * * {
                            outline: var(--outline-width) solid orange
                        }

                            * * * * * * * * {
                                outline: var(--outline-width) solid blue
                            }