Center vertical text on slider - css

Question

I'm using a template for my blog but I want to vertically align the text on the slider. I've tried changing the padding but then it's not centered while on mobile. Also when I change the top value from 0 to a percentile value it doesn't work.
.sora-slide .ty-thumb-bonos {
position: relative;
float: left;
margin: 0!important;
width: 100%;
height: 560px;
overflow: hidden;
display: block;
vertical-align: middle;
}
.sora-slide .sora-slide-con {
position: absolute;
left: 0;
right: 0;
margin: auto;
bottom: 0;
top: 0;
width: 100%;
padding: 20px 10px;
z-index: 2;
box-sizing: border-box;
text-align: center;
max-width: 460px;
display: table;
-webkit-transition: all 0.2s ease-in-out;
-moz-transition: all 0.2s ease-in-out;
-ms-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
}

Answer 1

You could add this to .sora-slide .sora-slide-con
transform: translateY(-50%);
top: 50%;
and replace
margin: 15% auto;
with
margin: 0 auto;
This should do it, if I understand you.
Full css:
.sora-slide .sora-slide-con {
position: absolute;
left: 0;
right: 0;
margin: 0 auto; /* <- 0 auto */
bottom: 0;
top: 50%; /* <- 50% instead of 0 */
width: 100%;
padding: 20px 10px;
z-index: 2;
box-sizing: border-box;
text-align: center;
max-width: 460px;
display: table;
-webkit-transition: all 0.2s ease-in-out;
-moz-transition: all 0.2s ease-in-out;
-ms-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
transform: translateY(-50%); /* <- transformY -50% */
}
To understand why I added transform and top, see this anwser on SO: https://stackoverflow.com/a/40530404/6773269 by
Andrew Bone.
He explained it very well.
Or like aldo.roman.nurena said:
TL;DR top applies 50% from page/container height, transform: translateY applies -50% from own element height.