/* style of body */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-image: url(../image/bg.png);
    /* thuộc tính thay đổi nền web bằng 1 bức ảnh */
    background-size: cover;
    /* chỉnh kích cỡ gackground: cover để căn theo kích cỡ màn web */
    background-attachment: fixed;
    /* chỉnh vị trí của background khi cuộn chuột: fixed cố định vị trí của background */
}

/* style of header */
header {

    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    height: 35px;
    background-color: rgba(0, 0, 0, 0.7);
}

nav ul {
    list-style: none;
}

nav ul li {
    float: left;
    line-height: 35px;
    padding: 0 15px;
}

nav ul li a {
    color: #fff;
    font-size: 14;
    text-decoration: none;
}

input {
    width: 60%;
}

/* Navbar container */
.navbar1 {
    overflow: hidden;
    background-color: #333;
    font-family: Arial, sans-serif;
}

/* Links inside the navbar */
.navbar1 a {
    float: left;
    font-size: 16px;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

/* The dropdown container */
.dropdown1 {
    float: left;
    overflow: hidden;
}

/* Dropdown button */
.dropdown1 .dropbtn1 {
    font-size: 16px;
    border: none;
    outline: none;
    color: white;
    padding: 14px 16px;
    background-color: inherit;
    font-family: inherit;
    margin: 0;
}

/* Add a background color to navbar links on hover */
.navbar1 a:hover,
.dropdown1:hover .dropbtn1 {
    background-color: red;
}

/* Dropdown content (hidden by default) */
.dropdown-content1 {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    z-index: 1;
}

/* Links inside the dropdown */
.dropdown-content1 a {
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

/* Add a background color to dropdown links on hover */
.dropdown-content1 a:hover {
    background-color: #ddd;
}

/* Show the dropdown menu on hover */
.dropdown1:hover .dropdown-content1 {
    display: block;
}

/* style cho container phần body */
.container {
    padding: 20px;
}

/* style phần mở đầu intro */
.intro {
    text-align: center;
    margin-bottom: 40px;
}

.intro h1 {
    color: white;
    font-size: 2.5em;
    margin-bottom: 10px;
}

.intro p {
    color: white;
    font-size: 1.2em;
}

/* style cho các hightlight khung trắng bên dưới */
.highlights {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.highlight {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin: 10px;
    padding: 20px;
    width: 30%;
    text-align: center;
    transition: transform 0.3s;
}

.highlight:hover {
    transform: scale(1.05);
}

.highlight img {
    max-width: 100%;
    border-radius: 10px;
    height: 80%;
}

/* style cho footer */
footer {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    text-align: center;
    padding: 10px;
    bottom: 0;
    position: fixed;
    width: 100%;
}