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HTML

            
              <div class="grid">

  <section class="sec01 grid_item">
    <header class="sec_header sec_header01">
      <h2 class="sec_header_inner">section01_header</h2>
    </header>
    <section class="sec_body">section01_contents</section>
  </section>

  <section class="sec02">
    <header class="sec_header grid">
      <h2 class="sec_header_inner grid_item">section02_header</h2>
    </header>
    <div class="grid">
      <div class="sec_body grid_item">section02_contents</div>
    </div>
  </section>

  <section class="sec03">
    <header class="sec_header grid">
      <h2 class="sec_header_inner grid_item">section03_header</h2>
    </header>
    <div class="grid">
      <div class="sec_body grid_item">section03_contents</div>
    </div>
  </section>
  <aside class="side">sidebar</aside>
</div>
!

CSS

            
              @charset "UTF-8";

*,
*:before,
*:after {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.side {
  background-color: #f099fa;
  padding: 20px;
}

.sec_header {
/*   color: #fff; */
  background-color: #9AFF8F;
}

.sec_header_inner {
  margin: 0;
  padding: 20px;
  background-color: rgba(255, 255, 255, 0.3);
}

.sec_body {
  background-color: #FFF28F;
  height: 100px;
  padding: 20px;
}

@media screen and (min-width: 600px) {
  .grid {
    display: grid;
    grid-template-columns: 1fr minmax(444px, 740px) minmax(24px, 40px) minmax(
        132px,
        220px
      ) 1fr;
    /* 				grid-template-rows: auto auto auto; */
    display: -ms-grid;
    -ms-grid-columns: 1fr minmax(444px, 740px) minmax(24px, 40px)
      minmax(132px, 220px) 1fr;
    /* 				-ms-grid-rows: auto auto auto; */
  }
  .grid_item {
    /* 				 grid-row: 1; */
    grid-column: 2;
    /* 				 -ms-grid-row: 1; */
    -ms-grid-column: 2;
  }
  .sec02,
  .sec03 {
    grid-row: 2;
    grid-column: 1 / -1;
    -ms-grid-row: 2;
    /* 				-ms-grid-column: 1; */
    -ms-grid-column-span: 5;
  }
  .sec03 {
    grid-row: 3;
    -ms-grid-row: 3;
  }
  .side {
    /* 				 grid-row: 1; */
    grid-column: 4;
    /* 				 -ms-grid-row: 1; */
    -ms-grid-column: 4;
  }
}
!

JS
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