html - 在响应版本中显示块

我有6张图片包裹在外部div中。

我想在移动版本中看到每行2张图像，因此应该有3列，每行2张图像。

我有这个HTML：

           * {
  box-sizing: border-box;
}

img {
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 100%;
}

.picture-box {
  width: 70%; /* limit screen width - max width could have been used aswell */
  margin: 0 auto; /* center content */
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
}

.ring {
  padding: 10px;
  text-align: center; /* Center ring div */
}

@media screen and (min-width: 1200px) {
   .ring {
      width: 25%;
    }
}

@media screen and (max-width: 1199px) {
   .ring {
      width: 33.33%;
    }
}

@media screen and (max-width: 768px) {
    .ring {
      width: 50%;
    }

    .picture-box {
      width: 100%;
    }
}

.thumb {
    display: inline-block;
  max-width: 200px;
  padding: 10px;
  border: 1px solid blue;
}

<div class="picture-box">
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
</div>  

Working JSFiddle Example

我试图将flex-direction从row更改为column，但这没有帮助。
我可能需要为它们写宽度，但不知道如何，现在我无法将它们变成一列。
我该如何解决？

最佳答案

这是你想要的？

我像您在问题中所问的那样使用width-这是一种实现方法。

这样，您可以控制要在每个断点中显示多少个框（.ring's）。

* {
  box-sizing: border-box;
}

img {
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 100%;
}

.picture-box {
  width: 70%; /* limit screen width - max width could have been used aswell */
  margin: 0 auto; /* center content */
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.ring {
  padding: 10px;
  text-align: center; /* Center ring div */
}

@media screen and (min-width: 1200px) {
   .ring {
      width: 25%;
    }
}

@media screen and (max-width: 1199px) {
   .ring {
      width: 33.33%;
    }
}

@media screen and (max-width: 768px) {
    .ring {
      width: 50%;
    }

    .picture-box {
      width: 100%;
    }
}

.thumb {
  display: inline-block;
  max-width: 200px;
  padding: 10px;
  border: 1px solid blue;
}

<div class="picture-box">
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
  <div class="ring">
    <div class="thumb">
      <img src="https://via.placeholder.com/200">
    </div>
  </div>
</div>

JSFiddle example