Update CSS

- center figure
- center table
- reduce space between figure and caption

css/readtheorg.css

@@ -348,6 +348,7 @@ table{
     empty-cells:show;
     margin-bottom:24px;
     border-bottom:1px solid #e1e4e5;
+    margin: 0 auto;
 }
 
 td{
@@ -372,6 +373,7 @@ table caption{
     color:#000;
     font:italic 85%/1 arial,sans-serif;
     padding:1em 0;
+    text-align: center;
 }
 
 table tr:nth-child(2n-1) td{
@@ -386,6 +388,8 @@ table tr:nth-child(2n) td{
     color:#000;
     font:italic 85%/1 arial,sans-serif;
     padding:1em 0;
+    text-align: center;
+    margin: 0;
 }
 
 .rotate-90{
@@ -920,6 +924,8 @@ footer p{
 
 #content img{
     max-width:100%;
+    display: block;
+    margin: 0 auto;
 }
 
 #content div.figure{