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<div class="row center">
    <div class="col-md-3 col-xs-6">
        <span class="arrow vtl"></span>
    </div>
    <div class="col-md-3 col-xs-6">
        <span class="arrow vtr"></span>
    </div>
    <div class="col-md-3 col-xs-6">
        <span class="arrow vbl"></span>
    </div>
    <div class="col-md-3 col-xs-6">
        <span class="arrow vbr"></span>
    </div>
</div>
<div class="row center mt-xl">
    <div class="col-md-3 col-xs-6">
        <span class="arrow hlb"></span>
    </div>
    <div class="col-md-3 col-xs-6">
        <span class="arrow hlt"></span>
    </div>
    <div class="col-md-3 col-xs-6">
        <span class="arrow hrb"></span>
    </div>
    <div class="col-md-3 col-xs-6">
        <span class="arrow hrt"></span>
    </div>
</div>