diff --git a/github-markdown.css b/github-markdown.css
index 9b68d8c..60261e8 100644
--- a/github-markdown.css
+++ b/github-markdown.css
@@ -226,13 +226,9 @@
 }
 
 .markdown-body .anchor {
-  position: absolute;
-  top: 0;
-  left: 0;
-  display: block;
-  padding-right: 6px;
-  padding-left: 30px;
-  margin-left: -30px;
+  display: inline-block;
+  padding-right: 2px;
+  margin-left: -18px;
 }
 
 .markdown-body .anchor:focus {
@@ -245,7 +241,6 @@
 .markdown-body h4,
 .markdown-body h5,
 .markdown-body h6 {
-  position: relative;
   margin-top: 1em;
   margin-bottom: 16px;
   font-weight: bold;
@@ -258,9 +253,9 @@
 .markdown-body h4 .octicon-link,
 .markdown-body h5 .octicon-link,
 .markdown-body h6 .octicon-link {
-  display: none;
   color: #000;
   vertical-align: middle;
+  visibility: hidden;
 }
 
 .markdown-body h1:hover .anchor,
@@ -269,8 +264,6 @@
 .markdown-body h4:hover .anchor,
 .markdown-body h5:hover .anchor,
 .markdown-body h6:hover .anchor {
-  padding-left: 8px;
-  margin-left: -30px;
   text-decoration: none;
 }
 
@@ -280,7 +273,7 @@
 .markdown-body h4:hover .anchor .octicon-link,
 .markdown-body h5:hover .anchor .octicon-link,
 .markdown-body h6:hover .anchor .octicon-link {
-  display: inline-block;
+  visibility: visible;
 }
 
 .markdown-body h1 {
@@ -435,7 +428,8 @@
 
 .markdown-body img {
   max-width: 100%;
-  box-sizing: border-box;
+  box-sizing: content-box;
+  background-color: #fff;
 }
 
 .markdown-body code {
@@ -631,6 +625,17 @@
   box-shadow: inset 0 -1px 0 #bbb;
 }
 
+.markdown-body:before {
+  display: table;
+  content: "";
+}
+
+.markdown-body:after {
+  display: table;
+  clear: both;
+  content: "";
+}
+
 .markdown-body .task-list-item {
   list-style-type: none;
 }