Make CSS Grid autocomplete only 2 columns

I am using CSS Grid and made the following layout in the code found here: https://codepen.io/alexg2195/pen/xLEeMd

My problem is that when repeat(auto-fill, minmax(400px, 1fr));

I use I get a layout that goes beyond two columns.

Is there a way to force two columns but still have the same autocomplete resizing modes?

body {
  margin: 40px;
}

.layout {
  display: grid;
  grid-gap: 10px;
  grid-template-columns: 1fr 100px;
  grid-template-areas: "main btn" "main .";
}

.btn {
  grid-area: btn;
  background-color: #444;
  color: #ddd;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}

.boxes {
  grid-area: main;
  display: grid;
  grid-gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
}

.box {
  background-color: #444;
  color: #fff;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}
      

<div class="layout">
  <div class="boxes">
    <div class="box a">A</div>
    <div class="box b">B</div>
    <div class="box c">C</div>
    <div class="box d">D</div>
    <div class="box e">E</div>
    <div class="box f">F</div>
    <div class="box g">G</div>
    <div class="box h">H</div>
    <div class="box i">I</div>
    <div class="box j">J</div>
    <div class="box k">K</div>
    <div class="box l">L</div>
    <div class="box m">M</div>
  </div>
  <div class="btn">BTN</div>
</div>
      

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Is there a way to force two columns, but still have the same minimal resizing?

Not with auto-fill

/ auto-fit

.

These functions are built to fit as many tracks as possible without overflowing the container.

7.2.2.2. Repeat to fill: auto-fill

and auto-fit

repeats

When auto-fill

specified as a repetition number, if the grid container has a specific size or maximum size on the corresponding axis, then the repetition count is the largest possible positive integer that does not overflow the grid container grid.

To "autocomplete" a maximum of two columns per row, you need to find another method.



Maybe flexbox?

modified demo

body {
  margin: 40px;
}

.layout {
  display: grid;
  grid-gap: 10px;
  grid-template-columns: 1fr 100px;
  grid-template-areas: "main btn" "main .";
}

.btn {
  grid-area: btn;
  background-color: #444;
  color: #ddd;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}

.boxes {
  grid-area: main;
  display: flex;
  flex-wrap: wrap;
}

.box {
  flex: 1 0 40%;
  margin: 5px;
  background-color: #444;
  color: #fff;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}

div.box.n {
  visibility: hidden;    /* https://stackoverflow.com/q/42176419/3597276 */
  height: 0;
}
      

<div class="layout">
  <div class="boxes">
    <div class="box a">A</div>
    <div class="box b">B</div>
    <div class="box c">C</div>
    <div class="box d">D</div>
    <div class="box e">E</div>
    <div class="box f">F</div>
    <div class="box g">G</div>
    <div class="box h">H</div>
    <div class="box i">I</div>
    <div class="box j">J</div>
    <div class="box k">K</div>
    <div class="box l">L</div>
    <div class="box m">M</div>
    <div class="box n">N</div>
  </div>
  <div class="btn">BTN</div>
</div>
      

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