customize the style for the selector

<style>
        /*Customizing the selector appearance at the time of rubberband selection. */
         #helper {
            stroke: black;
            stroke-width: 2px;
            stroke-dasharray:none;
            fill: gray;
            opacity: .1;
        } 
        /*Customizing the selector appearance after rubberband selection. */
         #resizeBorder {
            stroke: red;
            stroke-width: 5px;
            fill: #686868;
            opacity: .1;
        }
 
        /*Customizing the circle of the selector element.*/
        #nw-resize, #n-resize, #ne-resize, #w-resize, #e-resize, #sw-resize, #s-resize, #se-resize
        {
            stroke: red;
        }
</style>