diff --git a/static/stylesheet/style.less b/static/stylesheet/style.less
index e077d97..dd1fd83 100644
--- a/static/stylesheet/style.less
+++ b/static/stylesheet/style.less
@@ -292,10 +292,16 @@ a.btn:hover {
   background-color: @light-orange;
 }
 
-.center {
+.center, .text-center {
   text-align: center;
 }
 
+.img-center {
+  margin-left: auto;
+  margin-right: auto;
+  display: block;
+}
+
 .float-right {
   float: right;
 }
diff --git a/static/stylesheet/style.min.css b/static/stylesheet/style.min.css
index 0dcc706..1c990a3 100644
--- a/static/stylesheet/style.min.css
+++ b/static/stylesheet/style.min.css
@@ -1 +1 @@
-body,html{width:100%;height:100%}h1,h2,h3,h4,h5,h6{font-weight:300;line-height:1.1}h1{font-size:2.4em}h2{font-size:2em}h3{font-size:1.6em}h4{font-size:1.36em}h5{font-size:1.2em}h6{font-size:1.1em}body{margin:0;padding:0;background-color:#fff;color:#242121;font-family:Source Sans Pro,Verdana,sans-serif;font-size:1.02em;line-height:1.2em}a{color:#d9411e;text-decoration:none}a:hover{color:#ff5a09}hr{color:#eee;background-color:#eee;height:1px;border:none;margin-top:40px;margin-bottom:40px}img{max-width:100%}aside{background-color:#333;text-align:center}aside,aside a{color:#fff}aside a:hover{color:#eee}aside div{padding:20px;margin:0}aside div img{border-radius:50%;max-width:140px}aside div h1{margin:15px 0 5px}aside div p{margin:0 0 15px;font-size:.92em}aside nav ul li{display:inline;line-height:1.6em;font-size:1.28em;text-transform:lowercase}main nav{text-align:center;text-transform:uppercase;font-size:.72em;padding:14px 0;border-bottom:1px solid #eee}main nav a{padding:0 4px;border-right:1px solid #eee}main nav :first-child{border-left:1px solid #eee}main .pagination{margin:4% 8% 2%;height:20px}main .social-share p{font-size:.8em}main article{margin:0 8% 2%}main article header h1,main article header h2{margin-bottom:0}main article header p{color:#999;font-size:.82em}main article code,main article kbd,main article pre,main article samp{font-family:Source Code Pro,Consolas,monospace}main article blockquote,main article pre{background-color:hsla(0,0%,50%,.05);border-top-right-radius:5px;border-bottom-right-radius:5px;border-left:8px solid hsla(0,0%,50%,.075);border-left-width:10px}main article blockquote{padding:10px 20px;font-weight:300;font-size:1.1em}main article pre{padding:4px;font-size:.9em;overflow-x:auto}main article samp{white-space:pre;display:block;overflow-x:auto}main article kbd{padding:.1em .6em;border:1px solid rgba(63,63,63,.25);box-shadow:0 1px 0 rgba(63,63,63,.25);background-color:#fff;color:#333;border-radius:3px;display:inline-block;margin:0 .1em;white-space:nowrap;font-size:.78em}main article code{font-size:.8em;white-space:nowrap;color:#c25;padding:1px 3px;background-color:#f7f7f9;border:1px solid #e1e1e8;border-radius:3px}main article .comment-count{font-size:.8em}main article table{border-collapse:collapse;border-spacing:0}main article table thead:first-child tr:first-child th{border-top:0}main article table td,main article table th{padding:8px;line-height:20px;vertical-align:top;border-top:1px solid #ddd}main footer{padding-top:4px;border-top:1px solid #eee}main footer p{margin:2px;text-align:center;padding:0 40px;color:#999;font-size:11px}main .related-posts{border-top:1px solid #eee}.tag-cloud a{background-color:#d9411e;padding:.2em .6em;font-size:.74em;line-height:1;color:#fff;text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:.25em}.tag-cloud a:hover{background-color:#ff5a09}a.btn{background-color:#d9411e;padding:.4em .6em;font-size:.9em;line-height:1;color:#fff;text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:.25em}a.btn:hover{background-color:#ff5a09}.center{text-align:center}.float-right{float:right}ul.list,ul.social{list-style-type:none;margin:0;padding:0}ul.list{padding:1em 0}ul.list li{padding:4px}ul.social{font-size:1.6em;padding-top:20px}ul.social li{display:inline}ul.social a:hover{z-index:1;-webkit-transform:translateY(-5px);transform:translateY(-5px)}ul.social a{display:inline-block;width:36px;height:36px;border-radius:100%;text-align:center;font-size:.8em;line-height:36px}ul.social a.sc-facebook{background-color:#3e5b98}ul.social a.sc-google{background-color:#d93e2d}ul.social a.sc-pinterest{background-color:#c92619}ul.social a.sc-linkedin{background-color:#3371b7}ul.social a.sc-rss{background-color:#f26109}ul.social a.sc-stack-overflow{background-color:#f90}ul.social a.sc-twitter{background-color:#4da7de}ul.social a.sc-youtube{background-color:#e02a20}ul.social a.sc-github,ul.social a.sc-github-alt{background-color:#111010}ul.social a.sc-envelope-o{background-color:#578ad6}ul.social a.sc-reddit{background-color:#ff4500}@media screen and (min-width:768px){aside{width:25%;height:100%;position:fixed;top:0;left:0;overflow-y:auto}aside div{padding:36px 18px}aside div nav ul li{padding:0!important;display:block}aside div ul.social{padding-top:32px}main{width:75%;position:absolute;top:0;left:25%;overflow-x:hidden;overflow-y:hidden}main article ul.list li{padding:2px}}
\ No newline at end of file
+body,html{width:100%;height:100%}h1,h2,h3,h4,h5,h6{font-weight:300;line-height:1.1}h1{font-size:2.4em}h2{font-size:2em}h3{font-size:1.6em}h4{font-size:1.36em}h5{font-size:1.2em}h6{font-size:1.1em}body{margin:0;padding:0;background-color:#fff;color:#242121;font-family:Source Sans Pro,Verdana,sans-serif;font-size:1.02em;line-height:1.2em}a{color:#d9411e;text-decoration:none}a:hover{color:#ff5a09}hr{color:#eee;background-color:#eee;height:1px;border:none;margin-top:40px;margin-bottom:40px}img{max-width:100%}aside{background-color:#333;text-align:center}aside,aside a{color:#fff}aside a:hover{color:#eee}aside div{padding:20px;margin:0}aside div img{border-radius:50%;max-width:140px}aside div h1{margin:15px 0 5px}aside div p{margin:0 0 15px;font-size:.92em}aside nav ul li{display:inline;line-height:1.6em;font-size:1.28em;text-transform:lowercase}main nav{text-align:center;text-transform:uppercase;font-size:.72em;padding:14px 0;border-bottom:1px solid #eee}main nav a{padding:0 4px;border-right:1px solid #eee}main nav :first-child{border-left:1px solid #eee}main .pagination{margin:4% 8% 2%;height:20px}main .social-share p{font-size:.8em}main article{margin:0 8% 2%}main article header h1,main article header h2{margin-bottom:0}main article header p{color:#999;font-size:.82em}main article code,main article kbd,main article pre,main article samp{font-family:Source Code Pro,Consolas,monospace}main article blockquote,main article pre{background-color:hsla(0,0%,50%,.05);border-top-right-radius:5px;border-bottom-right-radius:5px;border-left:8px solid hsla(0,0%,50%,.075);border-left-width:10px}main article blockquote{padding:10px 20px;font-weight:300;font-size:1.1em}main article pre{padding:4px;font-size:.9em;overflow-x:auto}main article samp{white-space:pre;display:block;overflow-x:auto}main article kbd{padding:.1em .6em;border:1px solid rgba(63,63,63,.25);box-shadow:0 1px 0 rgba(63,63,63,.25);background-color:#fff;color:#333;border-radius:3px;display:inline-block;margin:0 .1em;white-space:nowrap;font-size:.78em}main article code{font-size:.8em;white-space:nowrap;color:#c25;padding:1px 3px;background-color:#f7f7f9;border:1px solid #e1e1e8;border-radius:3px}main article .comment-count{font-size:.8em}main article table{border-collapse:collapse;border-spacing:0}main article table thead:first-child tr:first-child th{border-top:0}main article table td,main article table th{padding:8px;line-height:20px;vertical-align:top;border-top:1px solid #ddd}main footer{padding-top:4px;border-top:1px solid #eee}main footer p{margin:2px;text-align:center;padding:0 40px;color:#999;font-size:11px}main .related-posts{border-top:1px solid #eee}.tag-cloud a{background-color:#d9411e;padding:.2em .6em;font-size:.74em;line-height:1;color:#fff;text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:.25em}.tag-cloud a:hover{background-color:#ff5a09}a.btn{background-color:#d9411e;padding:.4em .6em;font-size:.9em;line-height:1;color:#fff;text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:.25em}a.btn:hover{background-color:#ff5a09}.center,.text-center{text-align:center}.img-center{margin-left:auto;margin-right:auto;display:block}.float-right{float:right}ul.list,ul.social{list-style-type:none;margin:0;padding:0}ul.list{padding:1em 0}ul.list li{padding:4px}ul.social{font-size:1.6em;padding-top:20px}ul.social li{display:inline}ul.social a:hover{z-index:1;-webkit-transform:translateY(-5px);transform:translateY(-5px)}ul.social a{display:inline-block;width:36px;height:36px;border-radius:100%;text-align:center;font-size:.8em;line-height:36px}ul.social a.sc-facebook{background-color:#3e5b98}ul.social a.sc-google{background-color:#d93e2d}ul.social a.sc-pinterest{background-color:#c92619}ul.social a.sc-linkedin{background-color:#3371b7}ul.social a.sc-rss{background-color:#f26109}ul.social a.sc-stack-overflow{background-color:#f90}ul.social a.sc-twitter{background-color:#4da7de}ul.social a.sc-youtube{background-color:#e02a20}ul.social a.sc-github,ul.social a.sc-github-alt{background-color:#111010}ul.social a.sc-envelope-o{background-color:#578ad6}ul.social a.sc-reddit{background-color:#ff4500}@media screen and (min-width:768px){aside{width:25%;height:100%;position:fixed;top:0;left:0;overflow-y:auto}aside div{padding:36px 18px}aside div nav ul li{padding:0!important;display:block}aside div ul.social{padding-top:32px}main{width:75%;position:absolute;top:0;left:25%;overflow-x:hidden;overflow-y:hidden}main article ul.list li{padding:2px}}
\ No newline at end of file
diff --git a/templates/partial/og_article.html b/templates/partial/og_article.html
index 4e46494..c2c1cef 100644
--- a/templates/partial/og_article.html
+++ b/templates/partial/og_article.html
@@ -16,4 +16,8 @@
 {% for tag in article.tags %}
 <meta property="article:tag" content="{{ tag.name }}"/>
 {% endfor %}
-<meta property="og:image" content="{{ article.metadata.get('cover', SITELOGO) }}">
+{% if 'cover' in article.metadata %}
+<meta property="og:image" content="{{ SITEURL }}/{{ article.metadata['cover'] }}">
+{% else %}
+<meta property="og:image" content="{{ SITELOGO }}">
+{% endif %}