动画

箭头抖动

@keyframes bounce-up {
    25% {transform: translateY(10px);}
    50%, 100% {transform: translateY(0);}
    75% {transform: translateY(-10px);}
}

.animate-bounce-up{ 
    background:#ddd;
    width: 100px; 
    height: 100px; 
    margin:100px auto;
    animation: bounce-up 1.4s linear infinite;
}