将HTML框定位在面向下方的三角形中

Question

我收到了来自客户的不寻常的请求,那就是将他们提供的课程定位在朝下的三角形中.下图:

 X X X X
  X X X
   X X 
    X

其中X是其中一个方框.我已经完成了一些行类和偏移(下面),但我现在认为可能有一种更简单的方法来做到这一点,因为它不是完全可访问的布局(所有像素值和偏移都是硬编码的).我正在寻找一些关于如何响应地定位盒子或者更容易实现我在下面所做的事情的洞察力.

.item {
  text-align: center;
  width: 260px;
  float: left;
  box-sizing: border-box;
  padding: 10px;
}

.item button {
  float: right;
}

.row {
  width: 100%;
  clear: both;
}

.offset {
  position: relative;
}

.offset-1 {
  left: 130px;
}

.offset-2 {
  left: 260px;
}

.offset-3 {
  left: 390px;
}

<div class="row">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>
<div class="row offset offset-1">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>
<div class="row offset offset-2">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>
<div class="row offset offset-3">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>

Answer 1

偏移量类别不是必需的。

将text-align: center其放在行和display: inline-block物品上，然后就可以开始了。（有关居中的更多信息 - 请参阅本文）

更新了 Codepen

如果你需要它具有响应能力，你可以使用flexbox

.row {
  width: 100%;
  height: 23vw;
  text-align: center;
  display: flex;
  justify-content: center;
}
.item {
  text-align: center;
  box-sizing: border-box;
  padding: 10px;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 20vw;
  height: 16vw;
}
img {
  width 100%;
  height: 100%;
}
.item button {
  display: block;
  margin-top: 10px;
}

<div class="row">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>
<div class="row">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>
<div class="row">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>
<div class="row">
  <div class="item">
    <h3>Title</h3>
    <img src="http://dummyimage.com/250x200/000/fff.png">
    <button>Some button</button>
  </div>
</div>

更新了 Codepen (flexbox)