se: {
            top: heightDiff >= δ ? (heightDiff + δ) / 2 + 'px' : imgTop > heightDiff ? imgTop + 'px' : heightDiff + 'px',
            left: widthDiff >= -δ ? (widthDiff - δ) / 2 + 'px' : imgLeft > widthDiff ? imgLeft + 'px' : widthDiff + 'px'
          },