How do i reduce the width of a full-width WordPress theme

Thanks to anyone who responds in advance. My website at www.mediaroomhub.com is a full-width website theme. Please how do i reduce the width so that the background picture can show like I have it in the picture? I am not really good at CSS. I tried the following code but it didn’t work.

.sec-marg-out, .sec-marg-out2, .sec-marg-out4 {
width: 80%;

}

I want it like this please

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