.red-ball{animation:red-move 4s cubic-bezier(.4,0,.6,1) infinite}@keyframes red-move{0%,to{opacity:.35}50%{opacity:.15}}.blue-ball{animation:blue-move 4s cubic-bezier(.4,0,.6,1) infinite;animation-delay:3s}@keyframes blue-move{0%,to{opacity:.35}50%{opacity:.15}}