body {
    margin: 0px;
    padding: 0px;

}

h2 {
    text-align: center;
    margin-top: 30px;
}

.pt-list {
    list-style: none;
    margin: 0 auto;
    width: 550px;
    margin-top: 20px;
}

.pt-list > li {
    margin: 20px;
}