diff --git a/Resources/public/css/screen.css b/Resources/public/css/screen.css
index 6c21743..33f2eb3 100644
--- a/Resources/public/css/screen.css
+++ b/Resources/public/css/screen.css
@@ -258,6 +258,20 @@ li.operation div.heading h3 span {
   margin: 0;
   padding: 0;
 }
+li.operation div.heading h3 span.icon {
+    display: inline-block;
+    height: 12px;
+    width: 12px;
+    margin-left: 3px;
+    background: no-repeat center center;
+}
+li.operation div.heading h3 span.lock {
+    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAMCAYAAABbayygAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3QUHEisepJ6ljAAAAJ5JREFUGNNt0LEOAUEUheEPuwkFtSg0old4Eo/imbQKiULpBZQSCtFoaIjSktXMxpjsSW5xzvnnZmb4aYMymg9WEq1Decc1zCNkyxisoFGUTXDGEZpR8cIp8jccKiaLigwDdMP9hughr8ptALtYoB18C+Pgd5KXlrhgX5P/mSfmmKVgM/mmDP1qQ1rEyjFFkYKNmtMF3uikYFGzOdXnC5FWMZNd2GfvAAAAAElFTkSuQmCC");
+
+}
+li.operation div.heading h3 span.keys {
+    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAAMCAYAAAC0qUeeAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3QUHEisb1PRRAwAAAN9JREFUKM9lz71KQ0EQhuEnJ7EIKhZWaRULu4htLLwDvYRgZWmTWoI3kAuIlVik0U5Io4USRMFOUGwU7cQ/kAQMajMHDpuBZWd235lvPtjHDT4xxhuu0ZJEhhXU8YAG7rCKBWyn8EnkVSxjOuoPbKTT1/GXnCd0YqWt4uQrk3GLGcxiswgPcRgG4QsDzKMSKtUc/kUbFwEf4BlrUdeCk8WOj3jBO+5xhGOMwmQzh6Ec9zemwtgOLuN9D4tZYqwUSvnuu3jFHLpZASqHUqXQfIZe5PX8Y4RTLKGfqLVwjp9/HR4zOkGnnAoAAAAASUVORK5CYII=");
+}
 li.operation div.heading h3 span.http_method a, li.operation div.heading h3 span.deprecated a {
   text-transform: uppercase;
   text-decoration: none;
@@ -277,7 +291,7 @@ li.operation div.heading h3 span.deprecated a {
   background-color: #F00;
 }
 li.operation div.heading h3 span.path {
-  padding-left: 10px;
+  padding-left: 5px;
 }
 
 li.operation div.content {
@@ -551,11 +565,6 @@ form .request-content {
     margin-bottom: 10px;
 }
 
-.icon {
-  height: 12px;
-  margin-left: 3px;
-}
-
 .motd {
   padding:20px;
 }
\ No newline at end of file
diff --git a/Resources/public/image/keys.png b/Resources/public/image/keys.png
deleted file mode 100644
index 031fa39..0000000
Binary files a/Resources/public/image/keys.png and /dev/null differ
diff --git a/Resources/public/image/lock.png b/Resources/public/image/lock.png
deleted file mode 100644
index 3376980..0000000
Binary files a/Resources/public/image/lock.png and /dev/null differ
diff --git a/Resources/views/method.html.twig b/Resources/views/method.html.twig
index 6744316..1602b68 100644
--- a/Resources/views/method.html.twig
+++ b/Resources/views/method.html.twig
@@ -12,10 +12,10 @@
         {% endif %}
 
         {% if data.https %}
-            <img src="{{ asset('bundles/nelmioapidoc/image/lock.png') }}" class="icon" alt="HTTPS" />
+            <span class="icon lock" title="HTTPS"></span>
         {% endif %}
         {% if data.authentication %}
-            <img src="{{ asset('bundles/nelmioapidoc/image/keys.png') }}" class="icon" alt="Needs authentication" />
+            <span class="icon keys" title="Needs authentication"></span>
         {% endif %}
 
         <span class="path">