center h1 vertically and horizontally in an img element - html

Question

How do you center h1 in an img element, when the image is 100% of screens width and always maintaining aspect ratio? This pen shows what I mean. I've seen some answers here on SO, but the image always had width and height fixed.

Answer 1

to achieve your goal you need to put both img and h1 into a div and use positioning to center the h1
#headerImage {
width:100%;
margin-left:auto;
margin-right:auto;
background-position:center;
background-repeat:no-repeat;
}
#greeting{
padding: 0px;
position: relative;
}
#greetin-h1{
text-align: center;
color:#000;
position: absolute;
top:50%;
left:50%;
transform:translate(-50%,-50%);
z-index: 9999;
}
<div id="greeting">
<img id="headerImage" src="http://study.com/cimages/course-image/intro-to-business-syllabus-resource-lesson-plans_138757_large.jpg" alt=""/>
<h1 id="greetin-h1">THIS IS H1 ELEMENT</h1>
</div>

Answer 2

Why not using the image as background?
html, body{
width: 100vw;
}
#greeting{
padding: 140px 20px 50px 20px;
background-image: url("http://study.com/cimages/course-image/intro-to-business-syllabus-resource-lesson-plans_138757_large.jpg");
background-repeat: no-repeat;
background-size: cover;
}
#greetin-h1{
text-align: center;
color:black;
}
<div id="greeting">
<h1 id="greetin-h1">THIS IS H1 ELEMENT</h1>
</div>

Answer 3

greeting add css style
#greetin {
padding: 140px 20px 50px 20px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}

Answer 4

Use a combination of relative and absolute positioning, table and table-cell display like this:
CSS:
#headerImage {
position: relative;
text-align: center;
display: inline-block;
}
#headerImage img {
max-width: 100%;
}
#greeting {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
}
#greetin-h1 {
margin: 0;
display: table;
width: 100%;
height: 100%;
}
#greetin-h1 span {
display: table-cell;
vertical-align: middle;
}
HTML:
<div id="headerImage">
<div id="greeting">
<h1 id="greetin-h1"><span>THIS IS H1 ELEMENT</span></h1>
</div>
<img src="http://study.com/cimages/course-image/intro-to-business-syllabus-resource-lesson-plans_138757_large.jpg" alt="">
</div>
Fiddle: https://jsfiddle.net/ve8sot21/1
This way the h1 will always be centered horizontally and vertically no matter the image dimension.

Answer 5

.wrapper {
position: relative;
}
img {
display: block;
width: 100%;
}
h1 {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
color: gold;
}
<div class="wrapper">
<img src="https://www.propointgraphics.com/wp-content/uploads/2016/01/stock-photos-vince_3219813k.jpg" alt="">
<h1>Hello, World!</h1>
</div>