.nucleus{width:50px;height:50px;background:var(--primary-blue);border-radius:50%;display:flex;flex-direction:column;justify-content:center;align-items:center;color:white;z-index:10}.nucleus span{font-size:.8rem}.electron-shell{position:absolute;border:2px solid var(--border-color);border-radius:50%;display:flex;justify-content:center;align-items:center}.electron{position:absolute;width:10px;height:10px;background:var(--text-dark);border-radius:50%}.timeline-item{margin-bottom:.5rem}@media (max-width:768px){.nucleus span{font-size:.7rem}}