using images in next/previous_post_link [closed]

by

The path of image is incorrect.

Change

#blog .pagination span.left-arrow {
    background: url('arrow_left.png') no-repeat;
}

#blog .pagination span.right-arrow {
    background: url('arrow_right.png') no-repeat;
}

to

#blog .pagination span.left-arrow {
    background: url('img/arrow_left.png') no-repeat;
}

#blog .pagination span.right-arrow {
    background: url('img/arrow_right.png') no-repeat;
}