解决display:flex属性 justify-content: space-between换行后的排版问题

<style>.wrap {    width: 400px;    display:flex;  /*弹性盒子*/    justify-content: space-between;  /*两端对齐，子元素之间有间隙*/    flex-flow: row wrap;/*子元素溢出父容器时换行*/}span {width: 100px;background-color: green;color:#fff;border-radius: 5px;margin-top: 10px;padding: 10px;}</style><div class="wrap">    <span>11</span>    <span>22</span>    <span>33</span>    <span>44</span>    <span>55</span></div>