Bootstrap 3 Tutorial
BS Input Sizing
Input Sizing in Forms
Use classes such as .input-lg and .input-sm to specify the height of input components.
Use grid column classes such as.col-lg-* and.col-sm-* to specify element widths.
Height Sizing
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The examples below illustrate input components with varying heights:
Example
<form>
<div class="form-group">
<label for="inputsm">Small input</label>
<input class="form-control input-sm" id="inputsm" type="text">
</div>
<div class="form-group">
<label for="inputdefault">Default input</label>
<input class="form-control" id="inputdefault" type="text">
</div>
<div class="form-group">
<label for="inputlg">Large input</label>
<input class="form-control input-lg" id="inputlg" type="text">
</div>
</form>
To easily scale labels and form controls within a Horizontal form, add .form-group-* to the <div class=”form-group”> element.
Example
<div class="form-group form-group-lg">
Use the .input-group-sm or .input-group-lg classes to instantly scale all inputs and other elements within an .input-group:
Example
<div class="input-group input-group-lg">
Column Sizing
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The following examples demonstrate input elements with varying widths using various .col-xs-* classes:
Example
<div class="form-group row">
<div class="col-xs-2">
<label for="ex1">col-xs-2</label>
<input class="form-control" id="ex1" type="text">
</div>
<div class="col-xs-3">
<label for="ex2">col-xs-3</label>
<input class="form-control" id="ex2" type="text">
</div>
<div class="col-xs-4">
<label for="ex3">col-xs-4</label>
<input class="form-control" id="ex3" type="text">
</div>
</div>
Help Text
To add block-level help text in forms, use the .help-block class.
Example
<div class="form-group">
<label for="pwd">Password:</label>
<input type="password" class="form-control" id="pwd" placeholder="Enter password">
<span class="help-block">This is some help text...</span>
</div>
