body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #333333;
}

.container {
    width: 80%;
    margin: 0 auto;
    padding: 20px;
}

header {
    /* background-color: #2c3e50; */
    background-image: url('wallpaper1.png');
    color: #ffffff;
    padding: 20px 0;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.5em;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 20px 0 0;
    text-align: center;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-size: 1.2em;
}

section {
    margin: 40px 0;
}

h2 {
    border-bottom: 2px solid #2c3e50;
    padding-bottom: 10px;
    margin-bottom: 20px;
    color: #ffffff;
    background-image: url('wallpaper3.png')
}

.portrait {
    float: left;
    margin-right: 20px;
    border-radius: 50%;
    width: 150px;
    height: 150px;
    object-fit: cover;
}

.classoa {
    float: right;
    margin-right: 20px;
    margin-left: 5px;
    border-radius: 50%;
    width: 250px;
    height: 150px;
    object-fit: cover;
}

.intro {
    overflow: hidden;
}

article {
    margin-bottom: 20px;
}

footer {
    /* background-color: #2c3e50; */
    background-image: url('wallpaper2.png');
    color: #ffffff;
    text-align: center;
    font-weight: bold;
    padding: 10px 0;
}

footer p {
    margin: 0;
}