/* Reset some default styles */
body,
h3,
strong,
ul,
li {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background-color: #f7f7f8;
    color: #000;
    text-align: center;
    line-height: 1.6;
}

.main-div {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

h3 {
    font-size: 20px;
    margin-bottom: 20px;
}

strong {
    font-size: 20px;
    text-decoration: underline;
}

ul {
    list-style-type: square;
    text-align: left;
    margin-left: 30px;
    margin-top: 10px;
}

li {
    margin-top: 5px;
}

/* Media query for responsiveness */
@media (max-width: 768px) {
    .main-div {
        max-width: 90%;
    }
}