[css-color-5] Add big text section indicators

Author: tabatkins

css-color-5/Overview.bs

@@ -101,6 +101,16 @@ The [=xyz=] colorspace is CIE XYZ, with a D50 whitepoint, and allows computation
 in a linear-light-intensity space.
 
 
+<!--
+██     ██ ████ ██     ██
+███   ███  ██   ██   ██
+████ ████  ██    ██ ██
+██ ███ ██  ██     ███
+██     ██  ██    ██ ██
+██     ██  ██   ██   ██
+██     ██ ████ ██     ██
+-->
+
 Mixing colors: the ''color-mix()'' function {#color-mix}
 =====================================================
 
@@ -465,6 +475,16 @@ which is rgb(52.446% 45.821% 62.953%)
 
 Issue(#4711): <a href="https://github.com/w3c/csswg-drafts/issues/4711">color-mix to allow more than two colors?</a>
 
+<!--
+ ██████   ███████  ██    ██ ████████ ████████     ███     ██████  ████████
+██    ██ ██     ██ ███   ██    ██    ██     ██   ██ ██   ██    ██    ██
+██       ██     ██ ████  ██    ██    ██     ██  ██   ██  ██          ██
+██       ██     ██ ██ ██ ██    ██    ████████  ██     ██  ██████     ██
+██       ██     ██ ██  ████    ██    ██   ██   █████████       ██    ██
+██    ██ ██     ██ ██   ███    ██    ██    ██  ██     ██ ██    ██    ██
+ ██████   ███████  ██    ██    ██    ██     ██ ██     ██  ██████     ██
+-->
+
 Selecting the most contrasting color: the ''color-contrast()'' function {#colorcontrast}
 ========================================================================================
 
@@ -526,6 +546,16 @@ Selecting the most contrasting color: the ''color-contrast()'' function {#colorc
 		<!-- great example to use in WPT -->
 	</div>
 
+<!--
+   ███    ████████        ██ ██     ██  ██████  ████████
+  ██ ██   ██     ██       ██ ██     ██ ██    ██    ██
+ ██   ██  ██     ██       ██ ██     ██ ██          ██
+██     ██ ██     ██       ██ ██     ██  ██████     ██
+█████████ ██     ██ ██    ██ ██     ██       ██    ██
+██     ██ ██     ██ ██    ██ ██     ██ ██    ██    ██
+██     ██ ████████   ██████   ███████   ██████     ██
+-->
+
 Modifying colors {#colormodify}
 ===============================
 
@@ -586,8 +616,18 @@ Adjusting colors: the ''color-adjust'' function {#coloradjust}
 <!-- image out of sync with example
 	<img src="images/adjust_red_lightness30.png" alt="Result of adjust-color(red, lightness(30%)" /> -->
 
+<!--
+████████  ████████ ██          ███    ████████ ████ ██     ██ ████████
+██     ██ ██       ██         ██ ██      ██     ██  ██     ██ ██
+██     ██ ██       ██        ██   ██     ██     ██  ██     ██ ██
+████████  ██████   ██       ██     ██    ██     ██  ██     ██ ██████
+██   ██   ██       ██       █████████    ██     ██   ██   ██  ██
+██    ██  ██       ██       ██     ██    ██     ██    ██ ██   ██
+██     ██ ████████ ████████ ██     ██    ██    ████    ███    ████████
+-->
+
 Relative color syntax {#relative-colors}
---------------------------------------------------------
+----------------------------------------
 
 Besides specifying absolute coordinates, all color functions can also be used with a *relative syntax* to produce colors in the function's target [=colorspace=], based on an existing color (henceforth referred to as "origin color"). This syntax consists of the keyword ''from'', a <<color>> value, and optionally numerical coordinates specific to the color function. To allow calculations on the original color's coordinates, there are single-letter keywords for each coordinate and `alpha` that corresponds to the color's alpha. If no coordinates are specified, the function merely converts the origin color to the target function's [=colorspace=].