main [contenteditable]{text-transform:uppercase;opacity:.5}@keyframes shake{0%{transform:translateX(0)}20%{transform:translateX(-10px)}40%{transform:translateX(10px)}60%{transform:translateX(-10px)}80%{transform:translateX(10px)}100%{transform:translateX(0)}}.shake-animation{animation:shake 1s;display:inline-block}.feedback button{margin-bottom:.5em}