How to expand the length of the white content area ofn pages in Minamaze?

Hi — I am using a Minamaze child theme. On one of my pages I have quite a bit of content. Instead of automatically expanding to accommodate the length of the content, the content spills over into the background area below.

I have Simple Custom CSS and tried changing the “overflow: hidden;” to “overflow: auto:” but it did nothing. Does anyone know how to change this so that the white content area automatically expands? Thanks in advance for any help you can offer!!
}
body.custom-background #body-core {
max-width: 990px;
display: block;
margin: 0px auto;
overflow: hidden;
box-shadow: 0px 0px 5px 2px #CCC;
}
#body-core {
height: 100%;
}