.preses {
    margin-left: 30px;
    margin-right: 30px;
    margin-top: 20px;
    margin-bottom: 20px;
}

.centercontent {
    text-align: center;
    margin-left: 30px;
    margin-right: 30px;
    margin-top: 20px;
    margin-bottom: 20px;
}