ludo974
I thought you want to remove it, if you want to simply change the background image, please put above code again and add your own image by overriding the css rule:
.category-module.mod-owl .item-inner .decor.decor-0 {
background-image: url(../images/services/decor-0.png); }
.category-module.mod-owl .item-inner .decor.decor-1 {
background-image: url(../images/services/decor-1.png); }
.category-module.mod-owl .item-inner .decor.decor-2 {
background-image: url(../images/services/decor-2.png); }
And change above images by your own. It will not take the image that you put directly into the article like you're setting now.
The path of images as our demo site is in: /templates/ja_landscape/images/services/