/**BTN IR ARRIBA**/
.button-arriba {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    transition: all .5s ease;
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 99;
    display: flex;
    justify-content: center;
    align-items: center;
}

.button-arriba .item {
    width: 0%;
    height: 0%;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 3px 1px -2px rgba(0, 0, 0, 0.2),
        0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
    background-color: #666666;
    color: #fff !important;
    opacity: 0;
    transform: scale(0);
    cursor: pointer;
    box-shadow: var(--box-shadow);
    transition: all .5s ease;
}

.shows {
    animation: popup .5s ease-in-out !important;
    transform: scale(1) !important;
    opacity: 1 !important;
    width: 100% !important;
    height: 100% !important;
    transition: all .5s ease;
}

@keyframes popup {
    0% {
        width: 0% !important;
        height: 0% !important;
        opacity: 0 !important;
    }

    50% {
        width: 50% !important;
        height: 50% !important;
        opacity: 0.5 !important;
    }

    100% {
        width: 100% !important;
        height: 100% !important;
        opacity: 1 !important;
    }
}