Unable to get value for element.style

On the site created by WordPress, we have created a feature that allows you to zoom in and out of images by manipulating css left, top, transform:scale in jQuery/JavaScript.
In addition, I would like to get the above value, but the value is reflected in element.style and the acquisition is not successful.
Could you tell me how to get this "element.style" value?

Additional
As you advised me, I tried the following two patterns, but I got both errors.
I would appreciate it if you could point out what the problem is.

$(function(){
$("#ss").on("click", function(){
        // varimg_css = document.querySelector("#preveiw_card_image_innerimg").style;
        varimg_css=$("#preveiw_card_image_inner img");
        varcssvalue=getComputedStyle(img_css[0], "");
        // alert(img_css);
        alert(cssvalue);
    });
});