diff --git a/kalkulacka.html b/kalkulacka.html
index 53f8fd6..c595d5f 100644
--- a/kalkulacka.html
+++ b/kalkulacka.html
@@ -24,7 +24,41 @@
           </div>
     <!-- HLAVNÍ ČÁST KÓDU -->
     <main class="container">
-            <h1 class="display-1">Kalkulačka</h1>
+        <h1 class="display-1 text-center">Kalkulačka</h1>
+
+        <div class="row">
+          <div class="col-sm-10 offset-sm-1 text-center">
+              <form name="calc" action="" class="form-inline justify-content-center">
+                <input type="text" class="form-control" id="input_text">
+
+                <div class="text-center justify-content-center">
+                  <button type="button" class="btn btn-primary col-sm-2" onclick="addText('7')">7</button>
+                  <button type="button" class="btn btn-primary col-sm-2" onclick="addText('8')">8</button>
+                  <button type="button" class="btn btn-primary col-sm-2" onclick="addText('9')">9</button>
+                  <button type="button" class="btn btn-secondary col-sm-2" onclick="addText('+')">+</button>
+                </div>
+                <div class="text-center justify-content-center">
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('4')">4</button>
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('5')">5</button>
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('6')">6</button>
+                    <button type="button" class="btn btn-secondary col-sm-2" onclick="addText('-')">-</button>
+                </div>
+                <div class="text-center justify-content-center">
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('1')">1</button>
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('2')">2</button>
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('3')">3</button>
+                    <button type="button" class="btn btn-secondary col-sm-2" onclick="addText('*')">*</button>
+                </div>
+                <div class="text-center justify-content-center">
+                    <button type="button" class="btn btn-primary col-sm-2" onclick="addText('0')">0</button>
+                    <button type="button" class="btn btn-dark col-sm-2" onclick="addText('.')">.</button>
+                    <button type="button" class="btn btn-outline-dark col-sm-2" onclick="calculate()">=</button>
+                    <button type="button" class="btn btn-secondary col-sm-2" onclick="addText('/')">/</button>
+                </div>
+                
+              </form>
+          </div>
+        </div>
 
     </main>
     
@@ -42,5 +76,16 @@
 
 
     <script src="js/bootstrap.bundle.js"></script>
+    <script>
+    function calculate() {
+      // Zpracuje input, vypočítá obsah a vyhodí vysledek
+      document.calc.input_text.value = eval(document.calc.input_text.value);
+    }
+    
+    function addText(txt) {
+      document.getElementById("input_text").value += txt;
+    }
+    
+    </script>
 </body>
 </html>
\ No newline at end of file