Why the floor edge is still visible when it's in a ramp?

[1143413815422067]

Please take a look at the images below, my problem is, Why the floor edge is still visible when it's in a ramp?
the edge is already inside the ramp.

[marmiketin]

Check your graphic display settings (little cube bottom of the screen). There is probably a transparency set to the display. You could also use the join tool on the ramp and floor so the ramp cuts the floor

[cdatechguy]

Ramps can do goofy things sometimes. I prefer to just use a floor and modify the sub elements to get the slope.