Merge pull request #1096 from nobusugi246/fix_css_content_too_large

min-height of .content is too large.

dist/css/AdminLTE.css

@@ -143,7 +143,7 @@ body.hold-transition .main-header .logo {
 }
 /* Content */
 .content {
-  min-height: 250px;
+  min-height: 20px;
   padding: 15px;
   margin-right: auto;
   margin-left: auto;