html {
    scroll-behavior: smooth;
}

html, body {
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

body {
    font-family: 'Noto Sans HK', sans-serif;
    max-width: 100%;
    font-size: 19px;
    font-weight: 400;
    color: #777;
    margin: 0;
    padding: 0;
    line-height: normal;
    background: #fff;
}

img {
    max-width: 100%;
}

.header {
    background-color: #fff;
    padding: 15px;
    text-align: center;
    box-shadow: -2px -5px 26px -1px rgba(0,0,0,0.75);
    position: relative;
    z-index: 500;
}

.header img {
    max-width: 200px;
}

.top-banner {
    width: 100%;
    height: 580px;
    background-image: url("../images/top_banner.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    position: relative;
    z-index: 200;
}

.copyright {
    font-size: 15px;
    color: #fff;
    padding: 15px 0;
    background-color: #222;
}

.orange-text {
    color: #de6b3a;
}

h3 {
    color: #222;
}

.aboutus {
    background-color: #eee;
}

.aboutus h3:first-child {
    margin-top: 0;
}

.aboutus h3 {
    margin-top: 50px;
}

.aboutus-img {
    width: 100%;
    min-height: 480px;
    background-image: url("../images/aboutus.png");
    background-position: right bottom;
    background-size: cover;
}

.vision-box {
    color: #fff;
    padding: 15px;
    position: relative;
    overflow: hidden;
}

.vision-box::before {
    content: '';
    width: 100px;
    height: 100px;
    rotate: 45deg;
    position: absolute;
    background-color: #eee;
    left: -75px;
    top: -75px;
}

.vision-box.color-1 {
    background-color: #d85327;
}

.vision-box.color-2 {
    background-color: #144564;
}

.vision-box.color-3 {
    background-color: #e3ac24;
}

.small-text {
    font-size: 13px;
}