.site_button {
    width: 184px;
    height: 50px;
    border-radius: 6px;
    background: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 2px solid #DDD;
    color: #000;
    font-size: 16px;
    font-style: normal;
    font-weight: 500;
    line-height: normal;
    cursor: pointer;
    position: relative;
    transition: 0.6s;
    z-index: 1;
}

.btn_display_flex {
    transition: 0.6s;
    display: flex;
	align-items: center;
}

.header_btn_left_box_inner,
.banner_left_btn_box_inner,
.about_left_btn_box_inner,
.smartest_left_btn_box_inner,
.our_pro_btn_left_box_inner,
.help_left_btn_box_inner,
.our_quality_left_btn_box_inner,
.error_btn_box_inner {
    transition: 0.6s;
    margin-right: 10px;
}


/* ---------------- hover effect ---------- */
.site_button:after {
    position: absolute;
    content: "";
    height: 100%;
    width: 0;
    background: #000;
    top: 0;
    left: auto;
    transition: 0.6s;
    right: 0;
    z-index: -1;
    border-radius: 6px;
}

.site_button:hover:after {
    width: 100%;
    transition: 0.6s;
    /* height: 100%; */
    right: auto;
    left: 0;
}

.site_button:hover {
    color: #fff;
    z-index: 1;
    border: 0px solid transparent;
}


@media all and (min-width: 320px) and (max-width: 767px) {
    .site_button {
        width: 140px;
        height: 45px;
        font-size: 14px;
    }
}

@media all and (min-width: 768px) and (max-width: 980px) {
    .site_button {
        width: 140px;
        height: 45px;
        font-size: 14px;
    }
}

@media only screen and (min-width: 981px) and (max-width: 1024px) {
    .site_button {
        width: 140px;
        height: 45px;
        font-size: 14px;
    }
}

@media all and (min-width: 1025px) and (max-width: 1140px) {
    .site_button {
        width: 145px;
        height: 45px;
        font-size: 14px;
    }
}

@media all and (min-width: 1141px) and (max-width: 1280px) {
    .site_button {
        width: 145px;
        height: 45px;
        font-size: 14px;
    }
}

@media all and (min-width: 1281px) and (max-width: 1440px) {
    .site_button {
        width: 170px;
    }
}

@media all and (min-width: 1441px) and (max-width: 1680px) {}

@media all and (min-width: 1681px) and (max-width: 1880px) {}