Please add font-size:0 to ui-helper-clearfix:after
Now ui-helper-clearfix:after is
.ui-helper-clearfix:after { content: "."; display: block; height: 0;
clear: both; visibility: hidden; }
Please change it to
.ui-helper-clearfix:after { content: "."; display: block; height: 0;
font-size:0; clear: both; visibility: hidden; }