Hi scarlaiene
With this kind of custom css, you can get it done by your self. What I often do is that right click on any element that you want to custom style, let take 2 as sample:
There is a big space of point 2, you right click on that page, the inspect element will show you that it's a div tag of acm-clients-139 module, on the right side is how it's styled, you click the '+' icon to add your style, for example, you can add 'display: none' like my screenshot.
Then, you copy that style to custom.css file:
#acm-clients-139 {
display: none;
}
You can apply the same way for other parts.