/*  -- flex弹性布局 -- */
.flex {
    display: flex;
}

.basis-xs {
    flex-basis: 20%;
}

.basis-sm {
    flex-basis: 40%;
}

.basis-df {
    flex-basis: 50%;
}

.basis-lg {
    flex-basis: 60%;
}

.basis-xl {
    flex-basis: 80%;
}

.flex-shrink{
    flex-shrink:0;
}

.flex-sub {
    flex: 1;
}

.flex-twice {
    flex: 2;
}

.flex-treble {
    flex: 3;
}

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

.flex-wrap {
    flex-wrap: wrap;
}

.align-start {
    align-items: flex-start;
}

.align-end {
    align-items: flex-end;
}

.align-center {
    align-items: center;
}

.align-stretch {
    align-items: stretch;
}

.self-start {
    align-self: flex-start;
}

.self-end {
    align-self: flex-end;
}

.self-stretch {
    align-self: stretch;
}

.align-stretch {
    align-items: stretch;
}

.justify-start {
    justify-content: flex-start;
}

.justify-end {
    justify-content: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-around {
    justify-content: space-around;
}