```html
body {
fontfamily: Arial, sansserif;
margin: 0;
padding: 20px;
}
h1 {
textalign: center;
color: 333;
}
mindmap {
maxwidth: 800px;
margin: 20px auto;
border: 1px solid ccc;
borderradius: 8px;
overflow: hidden;
boxshadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
mindmap img {
width: 100%;
display: block;
}