Box, Flexbox, Flex

.flexCont{
  /* Box -----------------------------------------*/
  /* ch4, sf3.1, ios3.2, and2.1, op12.1 */
  display:-webkit-box;
  -webkit-box-orient:horizontal; /* [horizontal | vertical | inline-axis* | block-axis | inherit] */
  -webkit-box-direction:normal; /* [normal* | reverse | inherit] */
  -webkit-box-lines:multiple; /* [single* | multiple] */
  -webkit-box-pack:center; /* [start* | end | center | justify] */
  -webkit-box-align:stretch; /* [start | end | center | baseline | stretch*] */

  /* fx2 */
  display:-moz-box;
  -moz-box-orient:horizontal;
  -moz-box-direction:normal;
  -moz-box-lines:multiple;
  -moz-box-pack:center;
  -moz-box-align:stretch;

  /* flexbox -------------------------------------*/
  /* ie10 */
  display:-ms-flexbox;
  -ms-flex-direction:row; /* [row* | row-reverse | column | column-reverse] */
  -ms-flex-wrap:wrap; /* [nowrap* | wrap | wrap-reverse] */
  -ms-flex-pack:center; /* [flex-start* | flex-end | center | space-between | space-around] */
  -ms-flex-align:stretch; /* [start | end | center | baseline | stretch*] */

  /* flex ----------------------------------------*/
  /* ch21, sf6.1+, ios7+, op15 */
  display:-webkit-flex;
  -webkit-flex-direction:row; /* [row* | row-reverse | column | column-reverse ] */
  -webkit-flex-wrap:wrap; /* [nowrap* | wrap | wrap-reverse] */
  -webkit-justify-content:center; /* [flex-start* | flex-end | center | space-between | space-around] */
  -webkit-align-items:stretch; /* [flex-start | flex-end | center | baseline | stretch*] */

  /* ch28+, fx22+, op17+, ie11+ */
  display:flex;
  flex-direction:row;
  flex-wrap:wrap;
  justify-content:center;
  align-items:stretch;
}

.flexitem{
  /* Box -----------------------------------------*/
  /* ch4, sf3.1, ios3.2, and2.1+, fx2 op12.1 */
  box-flex:1; /* 0.0 */ 
  width:auto;
  /* 埋まらない時に可変する順番
  max-width:200px;
  box-flex-group:2;　/* 1 */
  */

  /* flexbox, flex -------------------------------*/
  /* ch21+, sf6.1+, fx22+, ios7+, op15+, ie11+ */
  flex-basis:auto; /* (=width) */
  flex-grow:1; /* 0 */
  flex-shrink:1; /* 0 */
}