.mb-0 {
    margin-bottom: 0px;
}
.mb-20 {
    margin-bottom: 20px;
}
.mt-10 {
    margin-top: 10px;
}
.mt-20 {
    margin-top: 20px;
}
.mr-10 {
    margin-right: 10px;
}
.ml-10 {
    margin-left: 10px;
}

.btn-xs {
    font-size: 75%;
    padding: 3px 6px;
}