如果跨度不能将图像居中于中间

I'm currently trying to centre these two images in the centre of the spans they are in however no matter what I do its just not having it! Any help would be appreciated!

The company I'm now working for uses wordpress and I'm very new to it.

The image linked is the elements that I'm working on.

have you tried this?

img.your-class {
display: block;
margin-left: auto;
margin-right: auto }

<img class="your-class" src="..." alt="...">

</div>