如何将图标定位到标题的右侧？

<div class="container">
  <h1 class="title">标题</h1>
  <img src="icon.png" class="icon">
</div>

.container {
  width: 100%;
  overflow: hidden;
}

.title {
  float: left;
}

.icon {
  float: right;
}

<div class="container">
  <h1 class="title">标题</h1>
  <img src="icon.png" class="icon">
</div>

.container {
  display: flex;
  align-items: center;
}

.title {
  flex: 1;
}

.icon {
  flex: 0;
}

<div class="container">
  <h1 class="title">标题</h1>
  <img src="icon.png" class="icon">
</div>

.container {
  position: relative;
}

.title {
  position: relative;
}

.icon {
  position: absolute;
  right: 0;
}