we already have a clearfix, class is cf

css/app.css

@@ -2089,23 +2089,4 @@ a.success-action {
 }
 ::-webkit-scrollbar-corner {
     background: transparent
-}
-
-/* clearfix */
-.clearfix:after {
-	content: ".";
-	display: block;
-	clear: both;
-	visibility: hidden;
-	line-height: 0;
-	height: 0;
-}
-.clearfix {
-	display: inline-block;
-}
-html[xmlns] .clearfix {
-	display: block;
-}
-* html .clearfix {
-	height: 1%;
-}
+}

js/id/ui/preset_grid.js

@@ -22,7 +22,7 @@ iD.ui.PresetGrid = function(context) {
             .attr('class', 'fillL inspector-body inspector-body-' + entity.geometry(context.graph()));
 
         var grid = gridwrap.append('div')
-            .attr('class', 'preset-grid fillL clearfix')
+            .attr('class', 'preset-grid fillL cf')
             .data([context.presets().defaults(entity, 36).collection]);
 
         var show_more = gridwrap.append('div')