Hi,
Well.. There is another kind of solution if the CSS does not work : the view override.
So in the view "checkout | cart" (because I suppose that you want to change the image size in the checkout cart) there is this code:
<td class="hikashop_cart_product_image_value">
<?php if(!empty($row->images)){
$image = reset($row->images);
$width = $this->config->get('thumbnail_x');
$height = $this->config->get('thumbnail_y');
$this->image->checkSize($width,$height,$image);
if(!$this->config->get('thumbnail')){
echo '<img src="'.$this->image->uploadFolder_url.$image->file_path.'" alt="'.$image->file_name.'" id="hikashop_main_image" style="margin-top:10px;margin-bottom:10px;display:inline-block;vertical-align:middle" />';
}else{ ?>
<div class="hikashop_cart_product_image_thumb" >
<?php echo $this->image->display($image->file_path,true,$image->file_name,'style="margin-top:10px;margin-bottom:10px;display:inline-block;vertical-align:middle"', '', $width, $height); ?>
</div>
<?php }
} ?>
</td>
By changing the values of $widht and $height you will change the width and the height of the thumbnail images.
So
$width = $this->config->get('thumbnail_x');
$height = $this->config->get('thumbnail_y');
will become:
$width = 80;
$height = 80;
For example...
Regards,