.button-up {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--color-primary);
    position: fixed;
    right: 32px;
    bottom: 32px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all .3s ease-in-out;
    z-index: 999;
    border: none;
    cursor: pointer;
}

.button-up.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.button-up-container {
    border-radius: 10px;
    border: 2px solid #FFF;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .3s ease-in-out;
}

.button-up-container svg path {
    fill: #fff;
    transition: all .3s ease-in-out;
}

.button-up:hover {
    background-color: #fff;
}

.button-up:hover .button-up-container {
    border: 2px solid var(--color-primary);
}

.button-up:hover .button-up-container svg path {
    fill: var(--color-primary);
}

/* Responsividade */
@media screen and (max-width: 550px) {
    .button-up {
        width: 70px;
        height: 70px;
          right: 14px;
    bottom: 14px;
    }

    .button-up-container {
        width: 60px;
        height: 60px;
    }
}