Take 2 columns in 2-columns layout but not when 1-column layout in CSS grid without @media

Question

The desired layout for wide screens:

The desired layout for narrow screens:

Initial CSS:

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Answer 1

Use grid-column: 1/-1;

.box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  grid-gap: 24px 40px;
}

span {
  height: 50px;
  background: blue;
}

.more {
  grid-column: 1/-1;
  background: red;
}

That you can edit like below if you want to always have a maximum of 2 columns:

.box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(max(240px,40vw), 1fr));
  grid-gap: 24px 40px;
}

span {
  height: 50px;
  background: blue;
}

.more {
  grid-column: 1/-1;
  background: red;
}