how to override left:0 using CSS or Jquery?

The default value for left is auto, so just set it to that and you will "reset" it.

.elem {
  left: auto;
}

Make sure that the above comes after the original CSS file.

Using CSS:

.elem {
    left: auto;
}

Using JQuery:

$(".elem").css("left", "auto");

Try auto property in CSS, which is equal to the default value.

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