@keyframes shake{0%,to{transform:translate(0)}25%,75%{transform:translate(7px)}50%{transform:translate(-7px)}}.error-message{color:red;animation:shake .5s ease-in-out 1.5;font-size:12px}.success-message{color:green;animation:shake .5s ease-in-out 1.5;font-size:12px}.tab-content>.active{display:block;animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.btn-gray{background-color:#6c757d;color:#fff}.btn-gray:hover{background-color:#5a6268;color:#fff}.btn-gray:active{background-color:#545b62;color:#fff}