'Flex items not centering vertically

I'm trying to center vertically the content with flex boxes without success. I don't like to use position or translate because it is not a fixed size. What is wrong with my code?

.row-centered {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.col-centered {
    display: flex;
    flex-direction: column;
    align-self: flex-start;
    float: none;
    margin-right: 0 auto;
}

.us-container{
  display: flex;
  justify-content: center;
  align-items: center;
  vertical-align: middle;
  resize: both;
  overflow: auto;
}

.us-container div{
  resize: both;
  overflow: auto;
}
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<section id="us" class="container-fluid">
        <div class="row row-centered  us-container">
            <div class="col-sm-8 col-md-8 col-xs-8 col-centered ">
                <p class="text-justify">blah blah blah blah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blah </p>
                <h3 class="text-center">blah blah blah</h3>
            </div>
            </div>
    </section>
htmlcssflexboxvertical-alignment


Solution 1:[1]

Add height: 100% to html, body, .container-fluid and make .container-fluid also be a flex container as shown below.

html, body, .container-fluid {
    height: 100%;
}

.row-centered, .container-fluid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.col-centered {
    display: flex;
    flex-direction: column;
    align-self: flex-start;
    float: none;
    margin-right: 0 auto;
}

.us-container{
  display: flex;
  justify-content: center;
  align-items: center;
  vertical-align: middle;
  resize: both;
  overflow: auto;
}

.us-container div{
  resize: both;
  overflow: auto;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<section id="us" class="container-fluid">
        <div class="row row-centered  us-container">
            <div class="col-sm-8 col-md-8 col-xs-8 col-centered ">
                <p class="text-justify">blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah </p>
                <h3 class="text-center">blah blah blah</h3>
            </div>
            </div>
    </section>

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Community

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