.btn_top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 56px;
    height: 56px;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity .3s ease, transform .3s ease, visibility .3s ease;
}

.btn_top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.btn_top svg {
    display: block;
    width: 100%;
    height: 100%;
}

.btn_top:hover {
    transform: translateY(-3px);
}

html {
    scroll-behavior: smooth;
}