@vanwels: The post container is already full width. It looks like you have used a plugin to showcase carousel gallery inside the post. If you increase the width of your content the margins will be removed as it is set to auto. If you would like to remove the margin with additional css, use the following code but the content may not be aligned properly after adding the css.
#fullpage #hero-section .entry-container {
margin:0;
}
You may try adding the carousel gallery in other sections as well. Alternatively, you can use the gallery section that is already available in the theme. You will need to install the Catch Gallery Plugin to get the gallery working as in the demo of the theme.
Let me know if you have any more theme related issues.
Regards,
Tikaram
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