flex box

2列2カラム
.select {
&__wrap {
.body {
&__box {
display: flex;
align-content: flex-start;

              flex-wrap: wrap;
            &--item {
              flex-basis: 48.5%;
              margin-right: auto;
              &:nth-child(2n){
                margin-left: auto;
              }
            }
          }
        }
      }


                      <div class="body">
        <ul class="body__box">
          <li class="body__box--item">
          </li>
          </ul>
          </div>