.flex-xs {
    display: flex;
}
.flex-column-xs {
    display: flex;
    flex-direction: column;
}

.flex-md {
    display:flex;
    flex-direction: column;
}
@media (min-width: 660px){
    .flex-md {
        flex-direction: row;
        display:flex;
    }
}
@media (min-width: 768px) {
    .flex-sm {

    }
    .flex-column-sm {
        display: flex;
        flex-direction: column;
    }

}
@media (min-width: 992px) {

    .flex-column-md {
        display: flex;
        flex-direction: column;
    }

}
@media (min-width: 1200px) {
    .flex-lg {
        display: flex;
    }
    .flex-column-lg {
        display: flex;
        flex-direction: column;
   }
    .flex-md {
        display:flex;
        flex-direction: row;
    }
}

@media (max-width: 991px) {
    .flex-sm-down {
        display: flex;
    }
    .flex-column-sm-down {
        display: flex;
        flex-direction: column;
    }
}

.flex-center-items {
    justify-content: center;
}
.flex-align-items-center {
    align-items: center;
}
.flex-align-items-start {
    align-items: flex-start;
}
.flex-align-items-end {
    align-items: flex-end;
}
.flex-wrap {
    flex-wrap: wrap;
    justify-content: flex-start;
}