问题描述:

How can I centre align text over an <img> preferably using 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>

网友答案:

The layout can be achieved with flexbox and positioning properties. No changes to HTML.

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

.text {
    position: absolute;  
    left: 50%;                        /* horizontal alignment */
    top: 50%;                         /* vertical alignment */
    transform: translate(-50%, -50%); /* horizontal, vertical alignment fine tuning;
                                        explanation: http://stackoverflow.com/q/36817249 */
 }

Revised Codepen

The code above centers the text both vertically and horizontally over the image:

网友答案:

You can just wrap an image with relatively positioned inline-block <div> and give the text this way:

* {margin: 0; padding: 0; list-style: none;}
.img-holder {position: relative; display: inline-block;}
.img-holder img {display: block;}
.img-holder p {position: absolute; top: 50%; left: 0; right: 0; transform: translate(0, -50%); text-align: center; color: #fff; text-shadow: 0 0 15px;}
<div class="img-holder">
  <img src="http://bit.ly/1YrRsis" alt="">
  <p>Text Aligned Centrally Vertical &amp; Horizontal.</p>
</div>
网友答案:

I've added another wrapper div surrounding the img and text as well as using flex to position the text. See this codepen

HTML:

<section class="height-100vh center-aligned">
  <div class="wrapper">
    <img class="background-image" src="http://bit.ly/1YrRsis" />
    <div class="text">SOME TEXT</div>
  </div>
</section>

CSS:

@import "bourbon";

body {
  margin: 0px;
}

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

.center-aligned {
  @include display(flex);
  @include align-items(center);
  @include justify-content(center);
}

.wrapper {
  position: relative;
}

.text {
  justify-content: center;
  align-items: center;
  display: flex;
  color: #fff;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
网友答案:

You also can center align text onto an image using display: inline-block; to the wrapper element.

.height-100vh {
  display: inline-block;
  position: relative;
}
.text {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
}
<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>
网友答案:

I added 2 more divs

<div class="text box" >
     <img src="images/woodenbridge.jpg" alt="Wooden Bridge"  />
     <div class="slide-box flex">
        <div class="flex-item"></div>
     </div>
</div>

and then styled as follows :

.flex-item {
    display: inline;
    align-self: center;
}
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