diff --git a/comparator.html b/comparator.html
index f02759a..68f8a81 100755
--- a/comparator.html
+++ b/comparator.html
@@ -7,6 +7,11 @@
     rel="stylesheet"
   />
   <link href="style.css" rel="stylesheet" />
+  <link
+    rel="stylesheet"
+    href="https://unpkg.com/@patternfly/patternfly/patternfly.css"
+    crossorigin="anonymous"
+  />
 </head>
 
 <body>
@@ -19,7 +24,7 @@
       size="14"
       autofocus
     />
-    <input type="submit" value="Insert" />
+    <input class="pf-c-button pf-m-primary" type="submit" value="Insert" />
   </form>
   <form id="deleteTree" onSubmit="return deleteCallback()">
     <input
@@ -29,7 +34,7 @@
       maxlength="4"
       size="14"
     />
-    <input type="submit" value="Delete" />
+    <input class="pf-c-button pf-m-primary" type="submit" value="Delete" />
   </form>
 
   <table>
diff --git a/index.html b/index.html
index fd2f609..3f0a64b 100755
--- a/index.html
+++ b/index.html
@@ -7,6 +7,11 @@
     rel="stylesheet"
   />
   <link href="style.css" rel="stylesheet" />
+  <link
+    rel="stylesheet"
+    href="https://unpkg.com/@patternfly/patternfly/patternfly.css"
+    crossorigin="anonymous"
+  />
 </head>
 
 <body>
@@ -19,7 +24,7 @@
       size="14"
       autofocus
     />
-    <input type="submit" value="Insert" />
+    <input class="pf-c-button pf-m-primary" type="submit" value="Insert" />
   </form>
   <form id="deleteTree" onSubmit="return deleteCallback()">
     <input
@@ -29,7 +34,7 @@
       maxlength="4"
       size="14"
     />
-    <input type="submit" value="Delete" />
+    <input class="pf-c-button pf-m-primary" type="submit" value="Delete" />
   </form>
 
   <p>Current operation: <span id="comment"></span></p>
diff --git a/style.css b/style.css
index 3a40d5b..bc3ea3f 100755
--- a/style.css
+++ b/style.css
@@ -1,23 +1,3 @@
-.node circle {
-  fill: #ecf0f1;
-  stroke: #3498db;
-  stroke-opacity: 0.8;
-  stroke-width: 2.5px;
-}
-
-.text {
-  font-family: "Open Sans", sans-serif;
-  fill: #3498db;
-  font-size: 16px;
-}
-
-.link {
-  fill: none;
-  stroke: #3498db;
-  stroke-opacity: 0.8;
-  stroke-width: 2px;
-}
-
 form {
   display: inline;
 }
