[css] Bootstrap 4 Center Vertical and Horizontal Alignment

been going thru a lot of posts on getting a form centered in the page and none of them worked. code below is from a react component using bootstrap 4.1. height should be 100vh and not 100%

<div className="container">
      <div className="d-flex justify-content-center align-items-center" style={height}>
        <form>
          <div className="form-group">
            <input className="form-control form-control-lg" placeholder="Email" type="email"/>
          </div>
          <div className="form-group">
            <input className="form-control form-control-lg" placeholder="Password" type="password"/>
          </div>
          <div className="form-group">
            <button className="btn btn-info btn-lg btn-block">Sign In</button>
          </div>
        </form>
      </div>
    </div>

where height in style is:

const height = { height: '100vh' }

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