@keyframes pulse {
    0% {background-color: #EEEEEE;}
    100% {background-color: #CCCCCC;}
    }

.div_top_bottom {
    display: flex;
    justify-content: center;
    align-items: center;

    background-color: #EEEEEE;
    border: 2px solid #FFFAFA;
    box-shadow: 0 0 8px #808080;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin: 32px 0;
    animation-name: pulse;
    animation-duration: 1.6s;
    animation-delay: 1s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    transition-duration:0.4s;
    }

.div_top_bottom:hover{
    border: 2px solid #AF0909;
    }