Hi there @michelia,
You were correct in using the ‘full’ image size, but you’ll also want to adjust the image width within the announcement container on the timeline. The width of the image is set to 100% by default, so regardless of the actual thumbnail size, the width extends to 100% (This is something we can address in a future release, so only the custom timeline express announcement image size is set to 100% while others remain at the original width.
For now, you just need to tweak the width CSS attribute on the image element.
Try adding the following to your themes ‘Additional CSS’ section of the customizer or within your themes style.css file:
.cd-timeline-title-container+img {
width: auto;
display: block;
margin: 0 auto;
margin-bottom: .75em;
max-width: 100%;
}
Let us know how that works for you.
I am not sure if I still need to keep the customized codes in the function.php, so I tried both ways. However, it doesn’t take any effect at all.
I used “my custom style plugin” and you can see my captured screen 
http://www.themichelia.com/style/
Thanks!
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This reply was modified 9 years, 3 months ago by
michelia.
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This reply was modified 9 years, 3 months ago by
michelia.
You may have to add !important tags to the end of them, depending on what is going on over on your site.
Try the following:
.cd-timeline-title-container+img {
width: auto !important;
display: block !important;
margin: 0 auto !important;
margin-bottom: .75em !important;
max-width: 100% !important;
}
Great!!! It worked perfectly!
Thanks a lot!
Awesome! No problem at all. Glad we could help out!
Have a great rest of your day!