Center Bootstrap form-group input field and make it smaller - html

Question

I'm currently trying to implement the design you see below:
Everything is working except for the size of the input field and the button. I'm using Boostrap.
HTML:
<div className='jumbotron text-center'>
<div className='container'>
<h1 id='hero-questions-h1'>What’s your name?</h1>
</div>
<div className='container'>
<div class="col-sm-4 text-center">
<div className="form-group input-group-lg">
<input type="text" className="form-control"></input>
</div>
<button type="button" id="continue-btn" className="btn btn-success btn-block">Continue</button>
</div>
</div>
<div className='container'>
<h2 id='tip'>
Tip! You will get motivational playlists, stories, posters and much more
</h2>
</div>
<footer className="footer">
<div className="container">
<p id="social-proof" className="text-center">“Must have for every ambitious athlete!”</p>
<p id="social-proof-tagline" className="text-center">Anders Hasselstrøm, Deca Ironman (10x)</p>
</div>
</footer>
</div>
CSS:
.jumbotron {
height: 100vh;
margin-bottom: 0px !important;
background-image: url("bg-hero-v2.png");
background-size: cover;
}
#hero-h1 {
color: white;
font-family: 'Roboto', sans-serif;
font-weight: 700;
font-size: 60px;
padding-top: 10%;
}
#hero-h2 {
color: #ECECEC;
font-family: 'Roboto', sans-serif;
font-weight: 300;
font-size: 20px;
margin-top: 30px;
line-height: 40px;
padding-bottom: 40px;
}
#hero-questions-h1 {
color: white;
font-family: 'Roboto', sans-serif;
font-weight: 700;
font-size: 60px;
padding-top: 10%;
padding-bottom: 30px;
}
.btn-success {
background-color: #66B878 !important;
}
.form-control {
background-color: transparent !important;
color: white !important;
}
#signup-btn {
padding-left: 40px;
padding-right: 40px;
padding-top: 15px;
padding-bottom: 15px;
}
#continue-btn {
height: 60px;
font-size: 18px;
}
#social-proof {
color: white;
font-family: 'Roboto', sans-serif;
font-weight: 500;
font-size: 18px;
font-style: italic;
}
#social-proof-tagline {
color: white;
font-family: 'Roboto', sans-serif;
font-weight: 100;
font-size: 16px;
}
#tip {
color: #ECECEC;
font-family: 'Roboto', sans-serif;
font-weight: 300;
font-size: 16px;
margin-top: 30px;
}
.footer {
padding-top: 20px;
padding-bottom: 20px;
position: fixed;
bottom: 0;
width: 100%;
background-color: black;
opacity: 0.6;
}
As you can see my current implementation looks like this:

Answer 1

DOM Elements use class instead of className to allocate CSS classes (You may have this confused with the JS .className property). To position the fields how you'd like, i would suggest taking advantage of the bootstrap grid col-x-offset-x options to position the column offset from the left side of the .row
For correct positioning, remember to place a .row element around your columns, and between the .container. Also, input elements are self-closing (ie. you dont need the trailing </input>)
HTML
<div class='jumbotron text-center'>
<div class='container'>
<h1 id='hero-questions-h1'>What’s your name?</h1>
</div>
<div class='container'>
<div class="row">
<div class="col-sm-offset-3 col-sm-6 text-center">
<div class="form-group input-group-lg">
<input type="text" class="form-control" />
</div>
<button type="button" id="continue-btn" class="btn btn-success btn-block">Continue</button>
</div>
</div>
</div>
<div class='container'>
<h2 id='tip'>
Tip! You will get motivational playlists, stories, posters and much more
</h2>
</div>
<footer class="footer">
<div class="container">
<p id="social-proof" class="text-center">“Must have for every ambitious athlete!”</p>
<p id="social-proof-tagline" class="text-center">Anders Hasselstrøm, Deca Ironman (10x)</p>
</div>
</footer>
</div>
JSFIDDLE

Answer 2

I was just working with bootstrap now and I had the same problem. In place of:
<div className='container'>
<div class="col-sm-4 text-center">
<div className="form-group input-group-lg">
<input type="text" className="form-control"></input>
</div>
<button type="button" id="continue-btn" className="btn btn-success btn-block">Continue</button>
</div>
</div>
Try this:
<div className='container'>
<div class="col-sm-4">
</div>
<div class="col-sm-4 text-center">
<div className="form-group input-group-lg">
<input type="text" className="form-control"></input>
</div>
<button type="button" id="continue-btn" className="btn btn-success btn-block">Continue</button>
</div>
<div class="col-sm-4">
</div>
The extra class with col-sm-4 will structure the divs in the correct order.
<div class="col-sm-4">
</div>
The is optional but I found that it helped me.