html{
    background-color: #f5f5f5;
}
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
}

h1,
h2,
h3 {
    color: #1a237e;
}

.section {
    margin-bottom: 30px;
}

ul {
    padding-left: 20px;
}

.tip-box {
    background-color: #f5f5f5;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
}

.section ul{
    list-style: '- ';
}