There is a min-height of 33vh set on sections. You need to override that to get the sections smaller.
For all sections this would be:
.page-section {
min-height: 0 !important;
}
For a specific section you need to specify the data-section-id that can be found by inspecting the page code using your browser's developer tools.
Somethig like this:
.page-section[data-section-id="5d979fd8590a832f3c411579"] {
min-height: 0 !important;
}
