在Bootstrap中水平居中视频 [英] Horizontally center video in Bootstrap

问题描述

在其他地方进行了研究，无法找到在Bootstrap div / header部分中水平居中视频的解决方案，同时保持视频与顶部垂直对齐。 Div / header部分是100％宽度，在某些视口断点处有两个固定高度。

Researched elsewhere, can't find a solution to horizontally center a video in a Bootstrap div / header section while keeping the video vertically aligned with the top. Div / header section is 100% width with two fixed heights at certain viewport breakpoints.

我尝试删除/重命名< header> 标签，以防Bootstrap的样式发生干扰。尝试< center> 标记，将视频标记指定为 display：inline 以及许多其他尝试。

I've tried removing/renaming the <header> tag in case Bootstrap's styles interfere. Tried <center> tags, specifying the video tag as display:inline and many many other attempts.

此示例中的视频以某些断点为中心，但在其他方面是左对齐的。我希望它在所有视口宽度中居中，并且也在顶部对齐。

The video in this example centers at certain breakpoints but otherwise is left-aligned. I'd like it to be centered throughout all viewport widths, and top aligned as well.

非常感谢！

HTML：

<header>
  <video loop muted autoplay poster="images/3671960.jpg" class="fullscreen-video">
        <source src="video/3671960.mp4" type="video/mp4">
  </video>
<div class="header-content">
  <div class="header-content-inner">
      <h1>A bunch of header text.</h1>
  </div>
</div>
<div class="launcher">
    <div class="launcher-inner">
      <a href="#what-i-do" class="btn btn-primary btn-outline-inverse page-scroll text-capitalize">Button text</a>
    </div>
</div>

CSS：

header {
position: relative;
text-align: center;
top: 0;
left: 0;
width:100%;
height: 475px;
color: #fff;
overflow: hidden;
margin: 0 auto;
}

header .fullscreen-video {
position: absolute;
top: 0;
left: 0;
min-width:100%;
min-height:100%;
z-index: -100;
}

@media (min-width: 768px) { 
header {
height: 665px;
}
}

推荐答案

HTML

<header>
  <video loop muted autoplay poster="images/3671960.jpg" class="fullscreen-video">
    <source src="video/3671960.mp4" type="video/mp4">
  </video>
<div class="header-content">
  <div class="header-content-inner">
      <h1>A bunch of header text.</h1>
  </div>
</div>
<div class="launcher">
    <div class="launcher-inner">
      <a href="#what-i-do" class="btn btn-primary btn-outline-inverse page-scroll text-capitalize">Button text</a>
    </div>
</div>
</header>

CSS

header {
  position: relative;
  text-align: center;
  top: 0;
  left: 0;
  width:100%;
  height: 475px;
  color: #fff;
  overflow: hidden;
  margin: 0 auto;
}

header .fullscreen-video {
  position: absolute;
  left: 50%;
  top: 0;
  -ms-transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
  min-width:100%;
  min-height:100%;
  z-index: -100;
}

@media (min-width: 768px) { 
  header {
    height: 665px;
  }
}

演示链接：https：//jsfiddle.net/hellosrini/vwc5hek0/

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