body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    color: #333;
}
.container {
    width: 90%;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
h1 {
    color: #3498db;
}
p {
    line-height: 1.6;
}
ul {
    list-style-type: square;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    margin-bottom: 20px;
}
.centered {
    width: 50%;
    height: auto;
    margin: 0 auto;
  }