.form tr:last-child > td { padding-bottom: 0 } /*not needed*/
#Compton_Scattering figure { width: calc(100% * 2 / 3) } /*bigger*/

@media only screen and (max-width: 600px) { /*ruler breakpoint*/
  #Compton_Scattering figure {
    margin-left: 0;
    margin-right: 0;
    width: 100%;
  }
}