如何使第一个网格项目跨度100%？

Question

我有以下桌面,它创建4个相等的列,全部为25%.

.footer-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

<div class="footer-inner">
  <div>One</div>
  <div>Two</div>
  <div>Three</div>
  <div>Four</div>
</div>

但是,如何在媒体查询中调整这些大小以使第一列达到100%并且其余列自然地包裹在下面,现在仍然使用CSS网格33.333%？

.footer-inner {
  display: grid;
  grid-template-columns: 100% 1fr 1fr 1fr; 
  /* AND THIS */
  grid-template-columns: 100% 33.333% 33.333% 33.333%;
}

Answer 1

将网格更改为三列,并将第一个div设置为在适当的位置跨越它们.

.footer-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.footer-inner div {
  border: 1px solid grey;
  text-align: center;
}

.footer-inner :first-child {
  grid-column: 1 / -1;
}

<div class="footer-inner">
  <div>One</div>
  <div>Two</div>
  <div>Three</div>
  <div>Four</div>
</div>

Answer 2

grid-column: span 3您可以使用以下设置来完成此操作:first-child：

.footer-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 650px) {
  .footer-inner {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-inner > div:first-child {
    grid-column: span 3;
    border: 1px solid;
  }
}

<div class="footer-inner">
  <div>One</div>
  <div>Two</div>
  <div>Three</div>
  <div>Four</div>
</div>