.back-to-top-btn {
    position: fixed;
    display: none;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 9999;
    border: none;
    transition: all 0.3s ease;
}

.back-to-top-btn.scale:hover {
    transform: scale(1.1);
}

.back-to-top-btn > * {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}