body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 20px;
    background-color: #f9f9f9;
    color: #333;
}
h1, h2, h3 {
    color: #2c3e50;
    margin-bottom: -10px;
}
.center {
    width: 90%;
    max-width: 600px;
    margin: 0 auto;
}
.example {
    background-color: #eef;
    border-left: 4px solid #5b9bd5;
    padding: 1px;
    padding-left: 25px;
}
.dash-list {
    list-style: none;
    padding-left: 20px;
}
.dash-list li::before {
    content: "-";
    padding-right: 10px;
}