.flex{
    display: flex;
}
.flex-col {
    display: flex;
    flex-direction: column;
}
.flex-item {
    flex: 1 1 auto;
}
.flex-center{
    justify-content: center;
    align-items: center;
}
.row-start {
    justify-content: flex-start;
}
.row-center{
    justify-content: center;
}
.row-end{
    justify-content: flex-end;
}
.row-between{
    justify-content: space-between;
}
.row-around {
    justify-content: space-around;
}
.col-start {
    align-items: flex-start;
}
.col-center{
    align-items: center;
}
.col-end{
    align-items: flex-end;
}
.col-between{
    align-items: space-between;
}
.col-around {
    align-items: space-around;

}