.blank5px {
    clear: both;
    font-size: 1px;
    height: 5px;
    line-height: 1px;
    visibility: hidden;
}

.blank10px {
    clear: both;
    font-size: 1px;
    height: 10px;
    line-height: 1px;
    visibility: hidden;
}

.blank15px {
    clear: both;
    font-size: 1px;
    height: 15px;
    line-height: 1px;
    visibility: hidden;
}

.blank20px {
    clear: both;
    font-size: 1px;
    height: 20px;
    line-height: 1px;
    visibility: hidden;
}

.blank25px {
    clear: both;
    font-size: 1px;
    height: 25px;
    line-height: 1px;
    visibility: hidden;
}

.blank30px {
    clear: both;
    font-size: 1px;
    height: 30px;
    line-height: 1px;
    visibility: hidden;
}