.scroll-to-top {
    position: fixed;
    bottom: 50px;
    right: 50px;
    z-index: 99;
    outline: none;
    font-size: 1.2rem;
    background-color: #000963;
    color: #fff;
    border: 1px solid #fff;
    cursor: pointer;
    padding: 1rem 1.5rem;
    border-radius: 6rem;
    box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
    transition: opacity 0.2s;
}

.scroll-to-top.invisible {
    opacity: 0;
    transition: opacity 0.2s;
}