How to center a absolute div inside a fixed div - css

Question

I have set up a modal for phots, so when i click on a small photo i get a larger photo up in a modal, the modal has position: fixed; and the modal-content has position: absolute; i can center it with margin: auto; left: 0; right: 0;but then the width goes all the way to the right and left, i want the modal content width to be the same as the photo inside it or the content of the modal-content
my code:
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding: 30px;
left: 0;
top: 0;
right: 0;
bottom: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
.modal-content {
background-color: #fefefe;
position: absolute;
top: 50px;
margin-bottom: 30px;
margin: auto;
border: 1px solid #888;
}
.modalimg {
position: relative;
text-align: center;
}
.modalimg img{
max-width: 100%;
max-height: 400px;
margin: auto;
top: 0;
left: 0;
right: 0;
bottom: 0;
position: relative;
box-shadow: 0 0 20px rgba(0,0,0,0.4);
}
its maybe a bit messy now but i have tried alot of different things with no luck..

Answer 1

This is what I use when I center an absolute-positioned element, this works for me all the time:
.absolute-center {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}

Answer 2

here you are please
.element {
position: absolute;
top: 15px;
z-index: 2;
width: 40%;
max-width: 960px;
min-width: 600px;
height: 60px;
overflow: hidden;
background: #fff;
margin: 0 auto;
left: 0;
right: 0;
background: red;
color: #fff;
text-align: center;
}
<div class="element">
text..
</div>

Answer 3

.modal-content {
background-color: #fefefe;
position: absolute;
top: 50px;
left: 50px;
right: 50px;
bottom: 50px;
border: 1px solid #888;
}

Answer 4

to align absolute div to center
left: 0;
right: 0
text-align: center
this will align the div in center.

Answer 5

Here's a possible solution that uses:
absolute positioning on the content container (.modal-content)
doesn't use absolute|fixed on the actual content
The content container (.modal-content) will grow along with its content. Finally, it's moved back to the middle using transform: translate(-50%, -50%);:
.modal {
position: fixed;
z-index: 1;
left: 0;
top: 0;
width: 100%;
height: 100%;
background-color: rgba(0,0,0,0.4);
}
.modal-content {
border: 1px solid red;
position: absolute;
top: 50%;
left: 50%;
border: 2px solid red;
transform: translate(-50%, -50%);
}
<div class="modal">
<div class="modal-content">
<img src="//placehold.it/200x200" alt="">
</div>
</div>
Demo
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