RW 6&7 One column of text instead of two in Blueballnewzpaper


I waited for RW7, just in case, but I have a problem with Blueballnewzpaper. I have the following CSS and RW displays perfectly with two columns of text, but Safari, Chrome and Firefox only display one. What have I done wrong?

.blog-entry-body {
margin-bottom: 16px;
text-indent: 20px;
text-align: justify;
padding: 0;
color: #4C4C4C;

-webkit-column-gap: 20px; /* Chrome, Safari, Opera */
-moz-column-gap: 20px; /* Firefox */
column-gap: 20px;

-webkit-columns:  2; /* Chrome, Safari, Opera */
-moz-columns:   2; /* Firefox */
columns:   2;