diff --git a/calc.css b/calc.css
index 08ef7e1..05f4962 100644
--- a/calc.css
+++ b/calc.css
@@ -4,9 +4,9 @@
     background-color: rgba(0, 0, 0, 0.5);
     color:aliceblue;
     height: 100px;
-    font-family: 'Ubuntu', sans-serif;
+    font-family: sans-serif;
     font-size: 35px;
-    width: 400px;
+    width: 500px;
     border-top: rgba(0, 0, 0, 0);
     border-left: rgba(0, 0, 0, 0);
     border-right: rgba(0, 0, 0, 0);
@@ -24,7 +24,7 @@
     height: 100px;
     background-color: rgba(0, 0, 0, 0.5);
     color:aliceblue;
-    font-family: 'Ubuntu', sans-serif;
+    font-family: sans-serif;
     font-size: 50px;
     border: rgba(0, 0, 0, 0);
     margin-left: -2;
@@ -35,7 +35,7 @@
     height: 100px;
     background-color: rgba(0, 0, 0, 0.5);
     color:aliceblue;
-    font-family: 'Ubuntu', sans-serif;
+    font-family: sans-serif;
     font-size: 50px;
     border: rgba(0, 0, 0, 0);
     margin-left: -3;
@@ -45,7 +45,7 @@
     height: 100px;
     background-color: rgba(0, 0, 0, 0.5);
     color:aliceblue;
-    font-family: 'Ubuntu', sans-serif;
+    font-family: sans-serif;
     font-size: 50px;
     border: rgba(0, 0, 0, 0);
     margin-left: -4;
@@ -82,4 +82,10 @@
 }
 button  {
     outline: none;
+}
+#zero {
+    width: 200px;
+}
+#equals {
+    width: 200px;
 }
\ No newline at end of file
diff --git a/calculator.php b/calculator.php
index dbbd63e..cc2f038 100644
--- a/calculator.php
+++ b/calculator.php
@@ -24,24 +24,32 @@
         <div id="calc">
         <form>
         <textarea id="eingabe" readonly></textarea>
+</br>
+        <button type="button" onclick="klammeraufb()" class="numberbutton" id="klammerauf">(</button> 
+        <button type="button" onclick="klammerzub()" class="numberbutton" id="klammerzu">)</button> 
+        <button type="button" onclick="pib()" class="numberbutton" id="pi">π</button>
+        <button type="button" onclick="CE()" class="numberbutton" id="ce">C</button>
+        <button type="button" onclick="back()" class="numberbutton" id="backspace">«</button> 
         </br>
         <button type="button" onclick="seven()" class="numberbutton" id="7">7</button>
         <button type="button" onclick="eight()" class="numberbutton" id="8">8</button>
         <button type="button" onclick="nine()" class="numberbutton" id="9">9</button> 
-        <button type="button" onclick="back()" class="numberbutton" id="backspace">«</button> 
+        <button type="button" onclick="geteiltb()" class="numberbutton" id="geteilt">/</button> 
+        <button type="button" onclick="quadratbb()" class="numberbutton" id="quadratb">x²</button> 
         </br>
         <button type="button" onclick="four()" class="numberbutton" id="4">4</button>
         <button type="button" onclick="five()" class="numberbutton" id="5">5</button>
-        <button type="button" onclick="six()" class="numberbutton" id="6">6</button> 
-        <button type="button" onclick="CE()" class="numberbutton" id="ce">CE</button> 
+        <button type="button" onclick="six()" class="numberbutton" id="6">6</button>  
+        <button type="button" onclick="malb()" class="numberbutton" id="mal">*</button>
+        <button type="button" onclick="wurzelbb()" class="numberbutton" id="wurzelb">√</button> 
         </br>
         <button type="button" onclick="one()" class="numberbutton" id="1">1</button>
         <button type="button" onclick="two()" class="numberbutton" id="2">2</button>
         <button type="button" onclick="three()" class="numberbutton" id="3">3</button>
         <button type="button" onclick="plusb()" class="numberbutton" id="plus">+</button> 
+        <button type="button" onclick="minusb()" class="numberbutton" id="minus">-</button>
         </br>
-        <button type="button" onclick="zero()" class="numberbutton" id="0">0</button>
-        <button type="button" onclick="pib()" class="numberbutton" id="pi">Pi</button>
+        <button type="button" onclick="zerobb()" class="numberbutton" id="zero">0</button>
         <button type="button" onclick="coma()" class="numberbutton" id="coma">,</button>
         <button type="button" onclick="equalsb()" class="numberbutton" id="equals">=</button>
 
@@ -86,7 +94,7 @@
             var t1 = document.getElementById("eingabe").value
             document.getElementById("eingabe").value = t1 + "9";
         }
-        function zero() {
+        function zerobb() {
             var t1 = document.getElementById("eingabe").value
             document.getElementById("eingabe").value = t1 + "0";
         }
@@ -100,7 +108,13 @@
         function equalsb() {
             var t1 = document.getElementById("eingabe").value  
             var t2 = t1.replace("𝜋", "Math.PI"); 
-            document.getElementById("eingabe").value = eval(t2);
+            var t3 = t2.replace("²", "^2");
+            if(t1 != "") {
+               document.getElementById("eingabe").value = eval(t3); 
+            } else {
+                document.getElementById("eingabe").value = ""; 
+            }
+            
         }
         function plusb() {
             var t1 = document.getElementById("eingabe").value
@@ -110,6 +124,34 @@
             var t1 = document.getElementById("eingabe").value
             document.getElementById("eingabe").value = t1 + "𝜋";
         }
+        function klammeraufb() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + "(";
+        }
+        function klammerzub() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + ")";
+        }
+        function malb() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + "*";
+        }
+        function geteiltb() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + "/";
+        }
+        function quadratbb() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + "²";
+        }
+        function minusb() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + "-";
+        }
+        function wurzelbb() {
+            var t1 = document.getElementById("eingabe").value
+            document.getElementById("eingabe").value = t1 + "√";
+        }
     </script>
 
     <!-- FOOTER ---------------------------------------->