Spacing (margin, padding) more than 5

Hi,

How can i give margin more than 5. I have tried increase the margin on Spacing property after 5 it set to auto. I could not click on the value to enter custom margin. Is this is normal or i’m i doing wrong. Kindly please explain me. Note: I’m trying to create a container after a fixed-top navbar, so i need margin top to place the container after the navbar container. Thanks