@-webkit-keyframes action {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}

@keyframes action {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}

.arrow {
    -webkit-animation: action 1s infinite  alternate;
    animation: action 1s infinite  alternate;
}

.expandable{
    cursor: pointer;
}