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>

Solution 1

To center text over an image you don't need flexbox. Just use CSS positioning properties.

.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 */
}

Revised Codepen

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

For a more detailed explanation of the centering method see:

Solution 2

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>

Now the <div> is an inline kinda element that you can style.

Preview:

Solution 3

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;
}

Solution 4

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>

Solution 5

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;
}

Solution 6

Responsive centered text content over image

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

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

.background-image {
  opacity: .3;
  width: 100%;
  object-fit:cover; 
  height: 100%;
}

.text {
  position: absolute;
  color: white;
  font-family:  'Gill Sans', 'Gill Sans MT';
  background: darkcyan;
  padding: 20px;
}
<section class="height-100vh center-aligned">
  <img class="background-image" src="https://www.humanesociety.org/sites/default/files/styles/768x326/public/2018/08/kitten-440379.jpg?h=f6a7b1af&itok=vU0J0uZR" />
  <div class="text">I'm in center</div>
</section>