diff --git a/email/base.gohtml b/email/base.gohtml
index c5d2968..aac1815 100644
--- a/email/base.gohtml
+++ b/email/base.gohtml
@@ -15,7 +15,7 @@
       height: 100%;
       margin: 0;
       line-height: 1.4;
-      background-color: #F2F4F6;
+      background-color: {{.App.Theme}};
       color: #74787E;
       -webkit-text-size-adjust: none;
     }
@@ -27,7 +27,7 @@
       width: 100%;
       margin: 0;
       padding: 0;
-      background-color: #F2F4F6;
+      background-color: {{.App.Theme}};
     }
     .email-content {
       width: 100%;
@@ -46,7 +46,7 @@
     .email-masthead_name {
       font-size: 16px;
       font-weight: bold;
-      color: #2F3133;
+      color: {{.App.TitleColor}};
       text-decoration: none;
       text-shadow: 0 1px 0 white;
     }
@@ -74,7 +74,7 @@
       text-align: center;
     }
     .email-footer p {
-      color: #AEAEAE;
+      color: {{.App.FooterColor}};
     }
     .body-action {
       width: 100%;
@@ -343,7 +343,7 @@
 
                     {{/* End Email */}}
                     <p>
-                      {{if .Signature}}{{.Signature}}{{else}}Best Regards{{end}},
+                      {{if .Signature}}{{.Signature}},{{else}}Best Regards,{{end}}
                       <br />
                       {{ if .Sender }}{{.Sender}}{{else}}{{.App.Name}}{{end}}
                     </p>
diff --git a/email/email.go b/email/email.go
index 0037f7e..01b6d7c 100644
--- a/email/email.go
+++ b/email/email.go
@@ -12,6 +12,7 @@ func init() {
 	viper.SetDefault("email.username", "test@kumoly.io")
 	viper.SetDefault("email.password", "test")
 	viper.SetDefault("logo", "http://www.duchess-france.org/wp-content/uploads/2016/01/gopher.png")
+	viper.SetDefault("email.theme", "#F2F4F6")
 }
 
 type App struct {
@@ -20,6 +21,9 @@ type App struct {
 	Logo        string
 	Copyright   string
 	TroubleText string
+	Theme       string
+	TitleColor  string
+	FooterColor string
 }
 
 type Button struct {
diff --git a/email/email_test.go b/email/email_test.go
index 99b7128..a46ffb6 100644
--- a/email/email_test.go
+++ b/email/email_test.go
@@ -47,6 +47,11 @@ func TestSend(t *testing.T) {
 	err := Send("test@kumoly.io",
 		[]string{"test@kumoly.io"}, "TestSend",
 		&Body{
+			App: App{
+				Logo:        "https://www.taishinlife.com.tw/assets/images/ui/site-header/taishin/logo.svg",
+				Theme:       "#d70c18",
+				FooterColor: "#ffffff",
+			},
 			Greeting: "歡迎",
 			Intros:   []string{"testing 1.", "loramipsum...."},
 			Outros:   []string{"testing 2,", "blah blah blah..."},
diff --git a/email/engine.go b/email/engine.go
index a4d2dad..54e433c 100644
--- a/email/engine.go
+++ b/email/engine.go
@@ -75,4 +75,13 @@ func merge(base *App) {
 	if base.TroubleText == "" {
 		base.TroubleText = app.TroubleText
 	}
+	if base.Theme == "" {
+		base.Theme = app.Theme
+	}
+	if base.TitleColor == "" {
+		base.TitleColor = app.TitleColor
+	}
+	if base.FooterColor == "" {
+		base.FooterColor = app.FooterColor
+	}
 }
diff --git a/email/service.go b/email/service.go
index cef0150..237f0eb 100644
--- a/email/service.go
+++ b/email/service.go
@@ -21,6 +21,9 @@ func (srv *Service) Init() error {
 		time.Now().Year(), app.Name)
 	app.Link = viper.GetString("server.url")
 	app.Logo = viper.GetString("logo")
+	app.Theme = viper.GetString("email.theme")
+	app.TitleColor = "#2F3133"
+	app.FooterColor = "#AEAEAE"
 
 	dial = DefaultDailer()
 
@@ -42,6 +45,9 @@ func setupDefault() {
 	app.Link = "https://kumoly.io"
 	app.Logo = "http://www.duchess-france.org/wp-content/uploads/2016/01/gopher.png"
 	app.TroubleText = "If you’re having trouble with the button '{ACTION}', copy and paste the URL below into your web browser."
+	app.Theme = "#F2F4F6"
+	app.TitleColor = "#2F3133"
+	app.FooterColor = "#AEAEAE"
 	dial = gomail.NewDialer("mail.kumoly.io", 587, "test@kumoly.io", "test")
 }