you need pillars, put pillars all arround the no green/yellow and make them touch/enter in the ground. If it are already touching the ground, dig a while arround the pillar and add one or two more pillar blocks, always making them touch/enter the ground.
yeah yeah… not originally mine, but a worked a lot on it.
The trick is, you will build it on Creative with or without pillars, anyway make plan under it. In game, after spawn it you add the pillars needed until it touch the ground. I did this way.
I have tried by using pillars i can get most green but the yellow pad always red, in creative its ok bacause i can use god mode and go under, on server its not as easy…
Pillars alone won’t work. You would need to extend the “bottom” of the base across the whole plane into the ground, but prior to completing this the pads would crumble. The only way I got it stable was placing half the structure underground, which I don’t think he wants. The only biom I didn’t try was lava…