button.back_to_top {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: #ff8800;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
    scroll-behavior: smooth;
}

button.back_to_top:hover {
    background-color: #ec7702 !important;
}

img#back_to_top {
    width: 24px;
    height: 24px;
}