To override bootstrap and other CSS styles, you need to add the following custom CSS:
.checklist .checkbox {
position: relative;
display: block;
margin-top: 5px;
margin-bottom: 5px;
}
.checklist .checkbox+.checkbox {
margin-top: 5px;
margin-bottom: 5px;
}
.checkbox {
color: red;
}
.well {
min-width: 250px;
}
.checklist .checkbox {
position: relative;
display: block;
margin-top: 5px;
margin-bottom: 5px;
}
.checklist .checkbox+.checkbox {
margin-top: 5px;
margin-bottom: 5px;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<div class="container">
<div class="row">
<div class="col-xs-12">
<div class="well">
<strong>Checkbox list:</strong>
<div class="row checklist">
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
<div class="checkbox col-xs-6 col-sm-4 col-md-3 col-lg-2">
<label style="white-space: nowrap;"><input type="checkbox">Check box 1</label>
</div>
</div>
</div>
</div>
</div>
</div>