bootstrap 4
by csornmo
HTML
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">
<div class="container">
<form>
<div class="form-group mt-3">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
<small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
</div>
<div class="form-group">
<label for="exampleInputPassword1">Password</label>
<input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
</div>
<div class="form-group">
<label for="exampleSelect1">Example select</label>
<select class="form-control" id="exampleSelect1">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
<div class="form-group">
<label for="exampleSelect2">Example multiple select</label>
<select multiple class="form-control" id="exampleSelect2">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
<div class="form-group">
<label for="exampleTextarea">Example textarea</label>
<textarea class="form-control" id="exampleTextarea" rows="3"></textarea>
</div>
<div class="form-group">
<label for="exampleInputFile">File input</label>
<input type="file" class="form-control-file" id="exampleInputFile" aria-describedby="fileHelp">
<small id="fileHelp" class="form-text text-muted">This is some placeholder block-level help text for the above input. It's a bit lighter and easily wraps to a new line.</small>
</div>
<fieldset class="form-group">
<legend>Radio buttons</legend>
<div...
CSS
.container {
margin-top: 20px;
margin-bottom: 20px;
}