.centerX {
    display: flex;
    justify-content: center;
}

.centerY {
    display: flex;
    align-items: center;
}

.centerXY {
    display: flex;
    justify-content: center;
    align-items: center;
}

.spreadX {
    width: 100%;
}

.spreadY {
    height: 100%;
}

.spreadXY {
    width: 100%;
    height: 100%;
}