Nav images

This is on my pictorialis, but i figured maybe someone here would know…
My nav link images are showing with a white background and a little border, but the images themselves are on a transparent, so I don’t know why they are showing that way.
The code:
<div style=”text-align:center”> <?php previous_post(‘%’, ‘<img src=https://moltenwords.net/picto/wp-images/left.gif “/>’, ‘no’, ‘yes’, 1, ”) ; ?>  <?php next_post(‘%’, ‘<img src=https://moltenwords.net/picto/wp-images/right.gif “/>’, ‘no’, ‘yes’, 1, ”) ; ?> </div>
It should look like this:
https://moltenwords.net/test.htm
but they look like this:
https://moltenwords.net/picto/index.php?p=63
Any idea on why and how to fix? Thanks ??