--- a/pkg/controllers/system.go	Fri Sep 28 11:48:57 2018 +0200
+++ b/pkg/controllers/system.go	Fri Sep 28 11:51:06 2018 +0200
@@ -15,6 +15,9 @@
 	getFeatureColourSQL = `SELECT r,g,b,a
 FROM systemconf.feature_colours
 WHERE feature_name = $1 AND style_attr = $2`
+	setFeatureColourSQL = `UPDATE systemconf.feature_colours
+SET (r, g, b, a) = ($3, $4, $5, $6)
+WHERE feature_name = $1 AND style_attr = $2`
 )
 
 // System status end points
@@ -97,3 +100,46 @@
 	}{c, fmt.Sprintf("rgba(%d, %d, %d, %g)", c.R, c.G, c.B, c.A)}
 	return
 }
+
+func setFeatureStyle(
+	input interface{},
+	req *http.Request,
+	db *sql.Conn,
+) (jr JSONResult, err error) {
+
+	feature := mux.Vars(req)["feature"]
+	attr := mux.Vars(req)["attr"]
+
+	c := input.(*models.Colour)
+	if !c.IsValid() {
+		err = JSONError{http.StatusBadRequest, "error: invalid colours"}
+		return
+	}
+
+	var res sql.Result
+	res, err = db.ExecContext(
+		req.Context(),
+		setFeatureColourSQL,
+		feature, attr,
+		c.R, c.G, c.B, c.A)
+
+	if err != nil {
+		return
+	}
+
+	if n, err2 := res.RowsAffected(); err2 == nil && n == 0 {
+		err = JSONError{
+			Code:    http.StatusNotFound,
+			Message: "Requestes style not found.",
+		}
+		return
+	}
+
+	jr = JSONResult{
+		Code: http.StatusCreated,
+		Result: struct {
+			Result string `json:"result"`
+		}{"success"},
+	}
+	return
+}