the structure is kind of like this
main#editordiv#app-previewheight from flexdivaddress bar thing,height: 48pxdiv.iframe-wrapperheight: calc(100% - 45px)i.e. 3px too talliframeheight: 100%
Glitch :・゚✧ test project, top and bottom of ellipse should be round. come to think of it, so should both sides