html - 如何使方框3对齐方框2的右侧？

我试图让我的“ this is box 3”与父容器内的“ this is box 2”的右侧对齐。方框3和方框2应该重叠并且彼此相邻吗？我曾尝试使用“ display：inline;但这并没有做任何事情。任何建议将不胜感激？

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

.container {
  width: 300px;
  height: 600px;
  border: 5px solid black;
  padding: 20px;
  margin: 0 auto;
}

.box1 {
  height: 50%;
  width: 90%;
  border: 1px solid black;
  padding-top: 10px;
  margin: 0 auto;
  text-align: center;
}

.box2 {
  height: 50%;
  width: 50%;
  border: 1px solid blue;
  text-align: center;
  margin-top: 10px;
}

.box3 {
  height: 50%;
  width: 50%;
  text-align: center;
  border: 1px solid red;
  float: right;
}

<div class="container">
  <div class="box1"> this is box 1 </div>
  <div class="box2"> this is box 2 </div>
  <div class="box3"> this is box 3 </div>
</div>

最佳答案

将float: left添加到.box2并将marign-top: 10px添加到.box3：

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

.container {
  width: 300px;
  height: 600px;
  border: 5px solid black;
  padding: 20px;
  margin: 0 auto;
}

.box1 {
  height: 50%;
  width: 90%;
  border: 1px solid black;
  padding-top: 10px;
  margin: 0 auto;
  text-align: center;
}

.box2 {
  height: 50%;
  width: 50%;
  border: 1px solid blue;
  text-align: center;
  margin-top: 10px;
  float: left;
}

.box3 {
  height: 50%;
  width: 50%;
  text-align: center;
  border: 1px solid red;
  float: right;
  margin-top: 10px;
}

<div class="container">
  <div class="box1"> this is box 1 </div>
  <div class="box2"> this is box 2 </div>
  <div class="box3"> this is box 3 </div>
</div>