K2 Smartforms: How to make Textarea resizable

script.js

$(document).ready(function(){
    $('textarea').each(function(index, obj){
        $wrapper = $(obj).closest('.input-control.text-input');
        var width = $wrapper.width();
        $wrapper.css('width', '');
        $(obj).css('width', width + 'px');
        $(obj).resizable();
    });
});

styles.css

.ui-resizable-se {
    cursor: se-resize;
    width: 12px;
    height: 12px;
    right: 1px;
    bottom: 1px;
}
.ui-resizable-handle {
    position: absolute;
    z-index: 99999;
    display: block;
}
.ui-icon-gripsmall-diagonal-se {
    background-position: -64px -224px;
}
.ui-icon {
    background-color: lightgray;
    display: block;
    text-indent: -99999px;
    overflow: hidden;
    background-repeat: no-repeat;
}
.ui-icon:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    border-top: 12px solid white;
    border-right: 12px solid lightgrey;
    width: 0;
}