diff --git a/README.md b/README.md
index c1f0dbd..7731718 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,10 @@ Multiple commands can be used. Turn on a globe, set the color to RGB value #9400
 
 `yeelight.exe -ip 10.1.1.15 -power on -rgb 9400d3 -brightness 100`
 
+Set colour using CSS named colours. See [here](https://css-tricks.com/snippets/css/named-colors-and-hex-equivalents/) for a list of valid values. 
+
+`yeelight.exe -ip 10.1.1.15 -css royalblue`
+
 Linux example showing HSV usage
 
 `./yeelight-linux --ip=10.250.1.117 --hsvHue=120 --hsvSat=100 --effect=sudden`
@@ -43,4 +47,4 @@ Linux example showing HSV usage
 - Initial release
 
 `1.1`
-- Added CSS Named colour flag (`-css`). See [here](https://css-tricks.com/snippets/css/named-colors-and-hex-equivalents/) for a list of valid colours. 
\ No newline at end of file
+- Added CSS Named colour flag (`-css`). 
\ No newline at end of file
diff --git a/src/main.go b/src/main.go
index 1577c16..3b3a2bd 100644
--- a/src/main.go
+++ b/src/main.go
@@ -7,6 +7,7 @@ import (
 	"net"
 	"os"
 	"strconv"
+	"strings"
 )
 
 //go:generate go run scripts/includejson.go
@@ -111,9 +112,10 @@ func main() {
 		}
 
 		css := cssInt.(map[string]interface{})
+		colour := strings.ToLower(*cssPtr)
 
-		if css[*cssPtr] != nil {
-			var rgbValue string = css[*cssPtr].(string)
+		if css[colour] != nil {
+			var rgbValue string = css[colour].(string)
 			var rgbDecimal string = hexToDec(rgbValue)
 			message := "{\"id\":1,\"method\":\"set_rgb\",\"params\":[" + rgbDecimal + ",\"" + *effectPtr + "\"," + strconv.Itoa(*durationPtr) + "]}"
 			send_message(*ipPtr, message)