footer {
    position: sticky;
    bottom: 0;
    text-align: center;
    width: 100%;
}

.btn-erea {
    display: inline-block;
    padding: 8px 24px;
    border-radius: 10px;
    margin: 8px;
    background-color: #ff54df;

}

.btn-01 {
    color: rgb(255, 255, 255);
}

.btn-erea:hover {
    background-color: #82046b;
}


.poyopoyo {
    animation: poyopoyo 2s ease-out infinite;
    opacity: 1;
}

/* ================================================
        アニメーション
==================================== */
@keyframes poyopoyo {

    0%,
    40%,
    60%,
    80% {
        transform: scale(1);
    }

    50%,
    70% {
        transform: scale(0.95);
    }
}