Syntax error fix in readme

sebastiandedeyne · web-flow · commit 009ccb10c300 · 2016-11-06T15:06:36.000+01:00
diff --git a/README.md b/README.md
@@ -83,7 +83,7 @@ A custom property is any property whose name starts with two dashes `--`. A prop
 Custom properties can be declared multiple times, but like variable scope in other languages, only the most specific one takes precedence.
 
 ```css
-:root: {
+:root {
     --some-color: red;
 }
 

Original file line number	Diff line number	Diff line change
@@ -83,7 +83,7 @@ A custom property is any property whose name starts with two dashes `--`. A prop
`83`	`83`	`Custom properties can be declared multiple times, but like variable scope in other languages, only the most specific one takes precedence.`
`84`	`84`
`85`	`85`	```css
`86`		`-:root: {`
	`86`	`+:root {`
`87`	`87`	`--some-color: red;`
`88`	`88`	`}`
`89`	`89`