html {
    scroll-behavior: smooth;
}

section .button-nav {
    position: fixed;
    top: 60%;
    right: 30px;
    display: flex;
    flex-direction: column;
    padding: 0 8px;
    z-index: 200;
}

section .button-nav .button-nav-buy {
    display: none;
}

section .button-nav-item,
section .back-top {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: #fff;
    margin-bottom: 8px;
}

section .back-top svg {
    width: 25px;
    height: 25px;
    font-weight: bold;
}

section .button-nav-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    max-width: 25px;
    max-height: 25px;
}

section .recommend-buy {
    position: fixed;
    top: 10%;
    right: 30px;
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 10px;
    z-index: 200;
}

section .recommend-buy:before {
    position: absolute;
    content: "";
    background-color: transparent;
    width: inherit;
    height: inherit;
    border-radius: inherit;
    z-index: -1;
    animation: sonarEffect ease 1s infinite;
    transition: 0.5s;
}

section .recommend-buy p {
    color: #fff;
    margin: 0;
}

@media (max-width: 576px) {

    section .button-nav-item,
    section .back-top {
        width: 35px;
        height: 35px;
        font-size: 14px;
        padding: 8px;
        margin-bottom: 0;
    }

    section .recommend-buy {
        display: none;
    }

    section .button-nav {
        top: 70%;
        transform: translatex(50%);
    }

    section .button-nav .button-nav-buy {
        /* display: block;
        padding: 8px 20px;
        width: max-content;
        border-radius: 30px;
        color: #fff;
        font-size: 16px; */
    }

    section .button-nav .button-nav-buy {
        display: block;
        width: 35px;
        height: 35px;
        font-size: 14px;
        padding: 8px;
        margin-bottom: 0;
        border-radius: 50%;
    }

    section .button-nav-buy img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        max-width: 25px;
        max-height: 25px;
        filter: brightness(0) invert(1);
    }

    section .button-nav .button-nav-buy p {
        margin: 0;
    }

    section .button-nav a+a {
        margin-top: 6px;
    }
}

@keyframes sonarEffect {
    0% {
        filter: alpha(opacity=30);
        opacity: 0.3;
    }

    40% {
        filter: alpha(opacity=50);
        opacity: 0.7;
        /* box-shadow: 0 0 0 1px rgba(239, 0, 50, 0.5);
    -webkit-box-shadow: 0 0 0 1px #0d73bb;  */
    }

    100% {
        /* box-shadow: 0 0 0 1px rgba(239, 0, 50, 0.5);
    -webkit-box-shadow: 0 0 0 1px #0d73bb; */
        -o-transform: scale(1.75);
        -webkit-transform: scale(1.75);
        -ms-transform: scale(1.75);
        transform: scale(1.75);
        filter: alpha(opacity=0);
        opacity: 0;
    }
}