如何使按钮居中并且其宽度是容器的百分比？

<div class="container">
  <button class="centered-button">按钮</button>
</div>

.container {
  display: flex;
  justify-content: center;
}

.centered-button {
  width: 80%; /* 设置按钮宽度为容器宽度的80% */
}

<div class="container">
  <button class="centered-button">按钮</button>
</div>

.container {
  position: relative;
}

.centered-button {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 80%; /* 设置按钮宽度为容器宽度的80% */
}