/* Two paint-only stepped boundaries; document geometry and About remain unchanged. */
#possibilities{clip-path:polygon(0 18px,38% 18px,38% 0,100% 0,100% 100%,0 100%)}
#solutions{clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),68% calc(100% - 18px),68% 100%,0 100%)}
@media(max-width:600px){
  #possibilities{clip-path:polygon(0 10px,42% 10px,42% 0,100% 0,100% 100%,0 100%)}
  #solutions{clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),72% calc(100% - 10px),72% 100%,0 100%)}
}