.mt20 {
    margin-top: 20px;
}

.mb20 {
    margin-bottom: 20px;
}

.p20 {
    padding: 20px;
}

.spai-hidden {
    display: none;
}

.overflow-hidden {
    overflow-y: hidden;
}

.center {
    text-align: center;
}

.spai-row {
    white-space: nowrap;
}
.spai-col-2 {
    white-space: normal;
    display: inline-block;
    width: 48%;
    vertical-align: top;
}
.spai-row .spai-col-2:first-child {
    margin-right: 4%;
}