Following your response I was annoyed that the shadows were no longer present. So I searched a bit and found another part of the solution which perhaps will lead you to the solution.
If I put your line of code, I get the result only on the multiline section but I have a problem on the other sections as said before.
However if I replace your line of code or add the one below, I get all sections correctly except the multiline:
.contains-content-container {
border-radius: 0 !important;
}