Matching width to screen size

I’m sure there are a million posts on this, but I cannot for the life of me figure out the wording under which they are classified.

I am trying to get my site to scale so that the width is 100% the width of the screen, and the height, if there’s more than can be viewed, is cut off. No scrolling.

If I simply use the 100% width property, it seems to also give height at 100% value, so this way the whole site fits on the screen, but there is empty space on the right and left which is not what I want. Does this make sense how I’ve worded it?