.nomargin {
    margin: 0 !important;
}
.margin20 {
    margin-top: 20px;
    margin-bottom: 20px;
}
.margin_right {
    margin-right: 20px;
}
.margin_top {
    margin-top: 20px;
}
.margin_left {
    margin-left: 20px;
}
.margin_bottom {
    margin-bottom: 20px;
}
.nomargin_bottom {
    margin-bottom: 0 !important;
}
.nomargin_left {
    margin-left: 0 !important;
}
.nomargin_top {
    margin-top: 0 !important;
}
.nomargin_right {
    margin-right: 0 !important;
}