Space between black and grey field

on this side there is a space between the black bar and the grey field with text below. I don´t know how to eliminate this space as it should not be there. Can you help me with this?

Thanks so much


I am not sure what cause it, but you can try to remove it by adding these css code using custom css plugin or in your child theme:

.site-content {
    margin-top: 25px;
    margin-bottom: -5px;

I know, how to fix it)
Add a custom css to your theme: {
    padding: 0 100px;
    background-color: #bcbcbc;
    border: 1px solid #bcbcbc;
    color: #000000;

And voila there is no gap!