header {
    display: flex;
    background-color: #333;
    padding: 20px;
}
header ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}
header ul li {
    display: inline;
    margin: 0 15px; 
}
header ul li a {
    color: white;
    text-decoration: none;
}
header ul li a:hover {
    text-decoration: underline;
}

body {
    font-family: 'Arial', monospace;
    font-size: large;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    background-image: url('Bridge.jpg');
    background-size: cover;
    background-position: center;
    background-color: #333;
    /* all browser no selection */
    user-select:  none;
    -webkit-user-drag: none;
    -webkit-user-select: none; 
    -moz-user-select: none; 
    -ms-user-select: none; 
}

.main {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.title {
    text-align: center;
}

.intro {
    display: flex;
    max-width: 1200px;
    padding: 20px;
}
.intro-text-section {
    display: flex;
    flex-direction: column;
    max-width: 50%;
    text-align: right;

}
.intro-text-supplement {
    display: flex;
    margin: auto;
}

.intro-image-section {
    display: flex;
    max-width: 50%;
    /* margin-left: 2%; */
}
.intro-image-section img {
    margin: auto;
    width: 60%;
    border-radius: 10px;
}

.content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 1200px;
}

.content-section {
    display: flex;
    flex-direction: row;
    align-items: center;
}
.content-image {
    max-width: 80%;
}
.content-image img {
    max-width: 100%;
    border-radius: 10px;
}
.content-text {
    max-width: 20%;
    margin-left: 5%;
}

footer {
    background-color: #333;
    padding-top: 10px;
    text-align: center;
    margin-top: auto;
    color: white;
}