.margin-15 {
    margin-top: 15px;
    margin-bottom: 15px;
}

.margin-30 {
    margin-top: 30px;
    margin-bottom: 30px;
}

.margin-45 {
    margin-top: 45px;
    margin-bottom: 45px;
}

.margin-60 {
    margin-top: 60px;
    margin-bottom: 60px;
}