在“浏览器”窗口中将Div垂直对齐（-不在其他元素内）

Question

I have a div which i want vertically aligned to 50% of the height of the browser window at all times.

I don't know what the height of the browser window is going to be at all times, should the user scale this window. If placing it within another element is necessary, great, but as just specified, I have no idea how tall the viewport is going to be at any one time.

I'm not going to be using javascript either.

I have read through the site, i have gone hunting for a solution, but I really want to throw this out there (again) as I have yet to find a solution that does exactly this, either by hook or by crook.

Thanks.

Answer 1

You don't specify if the has a fixed height or not? If so then you can do this with one element, just add the following example CSS:

.centered {
  height: 100px;
  width: 100%;
  background: red;
  position: absolute;
  top: 50%;
  left: 0;
  margin-top: -50px; /* half the height of the element */
}

You could use a number of techniques, depends on how you exactly want to implement it. Some (older) but still relevant reading here .