Hello @Lyser,
I can see that you are using Integrity stack. This stack will give you an option to have a Light or Dark theme. You can check this option in Pro > Integrity > Design. This is why by default, some parts of the page have the default white background colors. They have the following CSS styling built-in this stack styles.
.entry-wrap {
background-color: #fff;
}
article.comment {
background-color: #fff;
}
select, textarea, input[type="text"], input[type="password"],
input[type="datetime"], input[type="datetime-local"], input[type="date"],
input[type="month"], input[type="time"], input[type="week"],
input[type="number"], input[type="email"], input[type="url"],
input[type="search"], input[type="tel"], input[type="color"], .uneditable-input {
background-color: #fff;
}
Feel free again to modify the code and have a different background color for those areas in your page.