ぶるぶる

@keyframes wiggle {
0% { transform: rotate(0deg); }
80% { transform: rotate(0deg); }
85% { transform: rotate(5deg); }
95% { transform: rotate(-5deg); }
100% { transform: rotate(0deg); }
}

.wiggle:focus {
display: inline-block;
animation: wiggle 0.5s;
}