diff --git a/domain/consts.go b/domain/consts.go
new file mode 100644
index 0000000..9e67900
--- /dev/null
+++ b/domain/consts.go
@@ -0,0 +1,9 @@
+package domain
+
+const (
+	CookieToken        = "token"
+	CookieRefreshToken = "refresh"
+	CookieUser         = "user"
+
+	CookieSettingsDarkMode = "darkmode"
+)
diff --git a/handlers/handler.go b/handlers/handler.go
index 4cbfa70..d3c9f0f 100644
--- a/handlers/handler.go
+++ b/handlers/handler.go
@@ -3,6 +3,7 @@ package handlers
 import (
 	"errors"
 	"templ-test/client"
+	"templ-test/domain"
 	"templ-test/models"
 	"templ-test/services"
 	"time"
@@ -13,12 +14,6 @@ import (
 	"github.com/labstack/echo/v4"
 )
 
-const (
-	CookieToken        = "token"
-	CookieRefreshToken = "refresh"
-	CookieUser         = "user"
-)
-
 type Handlers struct {
 	api client.ApiClient
 	cfg services.EnvConfig
@@ -76,7 +71,7 @@ func ValidateJwt(ctx echo.Context, sharedSecret, issuer string) (jwtToken, error
 	if !token.Valid {
 		return jwtToken{}, errors.New("invalid jwt token")
 	}
-	
+
 	claims := token.Claims.(*jwtToken)
 	if !claims.Exp.After(time.Now()) {
 		return jwtToken{}, errors.New("the jwt token has expired")
@@ -91,17 +86,17 @@ func ValidateJwt(ctx echo.Context, sharedSecret, issuer string) (jwtToken, error
 func GetCookieValues(ctx echo.Context) models.AllCookies {
 	m := models.AllCookies{}
 
-	token, err := ctx.Cookie(CookieToken)
+	token, err := ctx.Cookie(domain.CookieToken)
 	if err == nil {
 		m.Token = token.Value
 	}
 
-	user, err := ctx.Cookie(CookieUser)
+	user, err := ctx.Cookie(domain.CookieUser)
 	if err == nil {
 		m.Username = user.Value
 	}
 
-	refresh, err := ctx.Cookie(CookieRefreshToken)
+	refresh, err := ctx.Cookie(domain.CookieRefreshToken)
 	if err == nil {
 		m.RefreshToken = refresh.Value
 	}