Vertically center a div inside another div

Question

I\'m trying to vertical-align: middle a div inside another div, but for some reason it\'s not working properly. What am I doing wrong?

Answer 1

Here is how I normally do this.

#wrapper {
border: 1px solid red;
width: 500px;
height: 500px;
position: relative;
}
#block {
border: 1px solid blue;
width: 500px;
height: 250px;
position: absolute;
top: 50%;
transform: translateY(-50%);
}

Easy way to make it dynamic.