Custom Class targeting specific text blocks not working.

All of a sudden I am having a problem targeting custom classes with Quick CSS. If I assign the custom class “texty1” to some of my text and then add:

.texty1 {
font-size: 55pt!important;
line-height: 55pt!important;
}

….to the Quick CSS section, nothing happens. It only seems to work if I enter that twice like this:

.texty1 {
font-size: 55pt!important;
line-height: 55pt!important;
}

.texty1 {
font-size: 55pt!important;
line-height: 55pt!important;
}