flex-direction

                                
<div id="wrap">
    <div class="flexArea fd-row">
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
    </div>

    <div class="flexArea fd-col">
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
    </div>

    <div class="flexArea fd-row-re">
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
    </div>

    <div class="flexArea fd-col-re">
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
        <div class="flexItem"></div>
    </div>
</div>

                                        
#wrap{padding: 50px; box-sizing: border-box;
    .flexArea{display: flex;
        .flexItem{display: flex; width: 200px; height: 200px; max-width: 200px; font-size: 16px; font-family: 'Noto Sans'; 
        color: #fff; background-color: #000;
            +.flexItem{margin-left: 10px;}
        }
        &.fd-row{flex-direction: row;}
        &.fd-col{flex-direction: column;
            .flexItem+.flexItem{margin: 10px 0 0 0;}
        }
        &.fd-row-re{flex-direction: row-reverse;
            .flexItem+.flexItem{margin: 0 10px 0 0;}
        }
        &.fd-col-re{flex-direction: column-reverse;
            .flexItem+.flexItem{margin: 0 0 10px 0;}
        }
    }
}

                                        
#wrap{
    padding: 50px;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

#wrap .flexArea {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}

#wrap .flexArea .flexItem {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    width: 200px;
    height: 200px;
    max-width: 200px;
    font-size: 16px;
    font-family: 'Noto Sans';
    color: #fff;
    background-color: #000;
}

#wrap .flexArea .flexItem + .flexItem {
    margin-left: 10px;
}

#wrap .flexArea.fd-row {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
        -ms-flex-direction: row;
            flex-direction: row;
}

#wrap .flexArea.fd-col {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
}

#wrap .flexArea.fd-col .flexItem + .flexItem {
    margin: 10px 0 0 0;
}

#wrap .flexArea.fd-row-re {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: reverse;
        -ms-flex-direction: row-reverse;
            flex-direction: row-reverse;
}

#wrap .flexArea.fd-row-re .flexItem + .flexItem {
    margin: 0 10px 0 0;
}

#wrap .flexArea.fd-col-re {
    -webkit-box-orient: vertical;
    -webkit-box-direction: reverse;
        -ms-flex-direction: column-reverse;
            flex-direction: column-reverse;
}

#wrap .flexArea.fd-col-re .flexItem + .flexItem {
    margin: 0 0 10px 0;
}

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