diff --git a/app/less/core.less b/app/less/core.less
index 5d25642..11d5741 100644
--- a/app/less/core.less
+++ b/app/less/core.less
@@ -30,4 +30,11 @@ button{
 	display: inline-block;
 	padding: 4px 16px;
 	font-size: 14px;
+}
+.clearfix {
+    &:after {
+	    content: "";
+	    clear: both;
+	    display: table;
+	}
 }
\ No newline at end of file