html - 在 flexbox 中将文本居中放置在图像上

Question

如何在 <img> 上居中对齐文本最好使用 FlexBox？

body {
  margin: 0px;
}

.height-100vh {
  height: 100vh;
}

.center-aligned {
  display: box;
  display: flex;
  box-align: center;
  align-items: center;
  box-pack: center;
  justify-content: center;
}

.background-image {
  position: relative;
}

.text {
  position: absolute;
}

<section class="height-100vh center-aligned">
  <img class="background-image" src="http://vignette2.wikia.nocookie.net/uncyclopedia/images/f/f8/Stand-out-in-the-crowd-300x300.jpg" />
  <div class="text">SOME TEXT</div>
</section>

Answer 1

要使文本在图像上居中，您不需要 flexbox。只需使用 CSS 定位属性。

.height-100vh {
    height: 100vh;
    position: relative;               /* establish nearest positioned ancestor for
                                         absolute positioning */
}

.text {
    position: absolute;  
    left: 50%;                        /* horizontal alignment */
    top: 50%;                         /* vertical alignment */
    transform: translate(-50%, -50%); /* precise centering; see link below */
}

body {
  margin: 0px;
}

.height-100vh {
  height: 100vh;
  display: flex;           /* establish flex container */
  flex-direction: column;  /* stack flex items vertically */
  position: relative;      /* establish nearest positioned ancenstor for absolute positioning */
}

.text {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-weight: bold;
}

.center-aligned {
  display: flex;
  align-items: center;
  justify-content: center;
}

<section class="height-100vh center-aligned">
  <img class="background-image" src="http://vignette2.wikia.nocookie.net/uncyclopedia/images/f/f8/Stand-out-in-the-crowd-300x300.jpg/revision/latest?cb=20090904155448" />
  <div class="text">SOME TEXT</div>
</section>

Revised Codepen

上面的代码将文本在图像上垂直和水平居中:

关于居中方法更详细的解释见:

• Element will not stay centered, especially when re-sizing screen