Hi Baard,
Your images have a white background by default, you can change this white background in the images themselves using any image editor.
To show the image in full width, you can add this CSS code to (Theme Options > CSS):
.x-topbar-inner.x-container.max.width {
width: 100%;
}
.x-topbar-inner .p-info {
float: none;
}
.x-topbar-inner .p-info img {
width: 100%!important;
}
As this is all custom development, regretfully we wont be able to assist further. Custom development is outside the scope of our support. We are happy to provide advice and get you started in the right direction, but you would still be responsible for the implementation. And moreover, this solution may not work after several updates especially if the themes structure changed or overridden.
I’ll list below some CSS/HTML resources that should help you to carry on these modifications on your own in the future:
Thanks.