diff --git a/.gitignore b/.gitignore
index 8525730..43982b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,7 +24,7 @@ moc_*.cpp
 qrc_*.cpp
 ui_*.h
 Makefile*
-*-build-*
+*build-*
 
 # QtCreator
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 747587b..5c2d093 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -2,6 +2,10 @@
 #include "ui_mainwindow.h"
 
 #include <QFile>
+#include <QTime>
+#include <QStyle>
+
+#include <QDebug>
 
 class QNetworkReply;
 namespace shutdown2 {
@@ -21,7 +25,11 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
 
     QFile css(":style.css");
     if (css.open(QFile::ReadOnly | QFile::Text))
-        this->setStyleSheet(css.readAll());
+        mCss = css.readAll();
+    setStyleSheet(mCss);
+
+    // init state machine
+    initStateMachine();
 }
 
 MainWindow::~MainWindow()
@@ -30,4 +38,37 @@ MainWindow::~MainWindow()
     delete mSettings;
 }
 
+void MainWindow::initStateMachine()
+{
+    // states
+    QState* on = new QState();
+    on->assignProperty(ui->btn_startstop, "on", false);
+    on->assignProperty(ui->lbl_timer, "on", false);
+
+    QState* off = new QState();
+    off->assignProperty(ui->btn_startstop, "on", true);
+    off->assignProperty(ui->lbl_timer, "on", true);
+
+    // transistions
+    on->addTransition(ui->btn_startstop, SIGNAL(clicked()), off);
+    off->addTransition(ui->btn_startstop, SIGNAL(clicked()), on);
+
+    // init
+    mState.addState(on);
+    mState.addState(off);
+    mState.setInitialState(off);
+    mState.start();
+}
+
+void MainWindow::triggerCssUpdate()
+{
+    qDebug() << QTime::currentTime() << "updating CSS"; // rogo: delete
+    setStyleSheet(mCss);
+}
+
+}
+
+void shutdown2::MainWindow::on_btn_startstop_clicked()
+{
+    triggerCssUpdate();
 }
diff --git a/mainwindow.h b/mainwindow.h
index 9fe1000..77f9c89 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -3,6 +3,7 @@
 
 #include <QMainWindow>
 #include <QSettings>
+#include <QStateMachine>
 
 namespace Ui {
 class MainWindow;
@@ -18,10 +19,18 @@ public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow() override;
 
+private slots:
+    void on_btn_startstop_clicked();
+
 private:
     Ui::MainWindow *ui;
 
     QSettings* mSettings = nullptr;
+    QStateMachine mState;
+    QByteArray mCss;
+
+    void initStateMachine();
+    void triggerCssUpdate();
 };
 
 }
diff --git a/mainwindow.ui b/mainwindow.ui
index 49549e7..e1f79ac 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>359</width>
-    <height>170</height>
+    <height>361</height>
    </rect>
   </property>
   <property name="contextMenuPolicy">
@@ -20,7 +20,84 @@
    <bool>false</bool>
   </property>
   <widget class="QWidget" name="centralWidget">
-   <layout class="QGridLayout" name="gridLayout"/>
+   <layout class="QGridLayout" name="gridLayout" rowstretch="1,4,1">
+    <property name="leftMargin">
+     <number>5</number>
+    </property>
+    <property name="topMargin">
+     <number>5</number>
+    </property>
+    <property name="rightMargin">
+     <number>5</number>
+    </property>
+    <property name="bottomMargin">
+     <number>5</number>
+    </property>
+    <property name="spacing">
+     <number>5</number>
+    </property>
+    <item row="1" column="0">
+     <widget class="QGroupBox" name="groupBox">
+      <property name="title">
+       <string/>
+      </property>
+      <property name="on" stdset="0">
+       <bool>false</bool>
+      </property>
+     </widget>
+    </item>
+    <item row="2" column="0">
+     <widget class="QPushButton" name="btn_startstop">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="font">
+       <font>
+        <pointsize>18</pointsize>
+       </font>
+      </property>
+      <property name="text">
+       <string>Start</string>
+      </property>
+      <property name="on" stdset="0">
+       <bool>false</bool>
+      </property>
+     </widget>
+    </item>
+    <item row="0" column="0">
+     <widget class="QLabel" name="lbl_timer">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="font">
+       <font>
+        <pointsize>28</pointsize>
+       </font>
+      </property>
+      <property name="frameShape">
+       <enum>QFrame::StyledPanel</enum>
+      </property>
+      <property name="frameShadow">
+       <enum>QFrame::Sunken</enum>
+      </property>
+      <property name="text">
+       <string>-- : --</string>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignCenter</set>
+      </property>
+      <property name="on" stdset="0">
+       <bool>false</bool>
+      </property>
+     </widget>
+    </item>
+   </layout>
   </widget>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
diff --git a/shutdown2.pro.user b/shutdown2.pro.user
index 7cd5faf..ab683fe 100644
--- a/shutdown2.pro.user
+++ b/shutdown2.pro.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.9.2, 2019-08-03T14:14:38. -->
+<!-- Written by QtCreator 4.9.2, 2019-08-03T15:45:41. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
@@ -71,7 +71,7 @@
    <value type="int" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
    <value type="int" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.0">
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">L:/workspace/build-yremote-Desktop_Qt_5_12_2_MinGW_64_bit-Debug</value>
+    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">L:/workspace/shutdown2/build-shutdown2-Desktop_Qt_5_12_2_MinGW_64_bit-Debug</value>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
      <valuemap type="QVariantMap" key="ProjectExplorer.BuildStepList.Step.0">
       <value type="bool" key="ProjectExplorer.BuildStep.Enabled">true</value>
@@ -305,9 +305,9 @@
     </valuelist>
     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">yremote</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">shutdown2</value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:L:/workspace/shutdown2/yremote.pro</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:L:/workspace/shutdown2/shutdown2.pro</value>
     <value type="QString" key="RunConfiguration.Arguments"></value>
     <value type="uint" key="RunConfiguration.QmlDebugServerPort">3768</value>
     <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
@@ -317,7 +317,7 @@
     <value type="bool" key="RunConfiguration.UseQmlDebugger">false</value>
     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
     <value type="QString" key="RunConfiguration.WorkingDirectory"></value>
-    <value type="QString" key="RunConfiguration.WorkingDirectory.default">L:/workspace/build-yremote-Desktop_Qt_5_12_2_MinGW_64_bit-Debug</value>
+    <value type="QString" key="RunConfiguration.WorkingDirectory.default">L:/workspace/shutdown2/build-shutdown2-Desktop_Qt_5_12_2_MinGW_64_bit-Debug</value>
    </valuemap>
    <value type="int" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
   </valuemap>
diff --git a/style.css b/style.css
index cd7600d..13d4c1f 100644
--- a/style.css
+++ b/style.css
@@ -1,15 +1,29 @@
+/*
+green #24e895
+grey  #404040
+white #edf2f4
+blue  #0077fd
+red   #d63429
+*/
+
+
 QMainWindow {
     background-color: #404040;
     border-color: #edf2f4;
 }
 
-QPushButton {
-    background-color: #404040;
+QPushButton[on=true] {
+    background-color: #d63429;
     color: #edf2f4;
 }
 
+QPushButton[on=false] {
+    background-color: #24e895;
+    color: #404040;
+}
+
 QPushButton:hover {
-    border: 1px solid #0077fd;
+    border: 1px solid #edf2f4;
 }
 
 QLineEdit {
@@ -26,9 +40,17 @@ QLabel {
     color: #edf2f4;
 }
 
+QLabel#lbl_timer[on=false] {
+    border: 1px solid #d63429;
+}
+
+QLabel#lbl_timer[on=true] {
+    border: 1px solid #24e895;
+}
+
 QGroupBox {
     color: #edf2f4;
-    border: 1px solid #0077fd;
+    border: 1px solid #edf2f4;
     margin-top: 5px;
 }
 
@@ -37,7 +59,7 @@ QGroupBox::title {
     left: 5px;
     padding: 0px 5px 0px 5px;
  }
-
+/*
 QLabel#lbl_volume:hover {
-    border: 1px solid #0077fd;
-}
+    border: 1px solid var(--highlight-blue);
+}*/