How to make space between two text boxes in bootstrap - html

Question

I need small white space between two text boxes.
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet" />
<div class="row col-lg-12 col-sm-12">
<div class="input-group col-md-8">
<span class="control-label">Product Name*</span>
<input type="text" class="form-control" placeholder="Product Name" id="productname" required>
</div>
<div class="input-group col-md-4" style=>
<span class="control-label">Short Name*</span>
<input type="text" class="form-control" placeholder="ShortName" id="shortname" required>
</div>
</div>

Answer 1

Are you want space between the textbox? i mean in small device it having in two row .so there is add mt-3(margin-top) for below margin to each input-group
Is this issue?
Add mt-3(margin-top) to each input-group and also add a width to span for correct alignment like this span{width:130px;}
span{
width:130px;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="container-fluid">
<div class="row">
<div class="input-group col-12 mt-3">
<span class="control-label d-flex h-100 align-items-center">Product Name* </span>
<input type="text" class="form-control" placeholder="Product Name" id="productname" required>
</div>
<div class="input-group col-12 mt-3" style=>
<span class="control-label d-flex h-100 align-items-center">Short Name* </span>
<input type="text" class="form-control"placeholder="ShortName" id="shortname" required>
</div>
</div>
</div>

Answer 2

You may use margin or padding class on your span element :
example
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet" />
<div class="row col-lg-12 col-sm-12">
<div class="input-group col-md-8">
<span class="control-label px-1">Product Name*</span>
<input type="text" class="form-control" placeholder="Product Name" id="productname" required>
</div>
<div class="input-group col-md-4" style=>
<span class="control-label px-1">Short Name*</span>
<input type="text" class="form-control" placeholder="ShortName" id="shortname" required>
</div>
</div>
https://getbootstrap.com/docs/4.5/utilities/spacing/
Spacing
Bootstrap includes a wide range of shorthand responsive margin and padding utility classes to modify an element’s appearance.
How it works
Assign responsive-friendly margin or padding values to an element or a subset of its sides with shorthand classes. Includes support for individual properties, all properties, and vertical and horizontal properties. Classes are built from a default Sass map ranging from .25rem to 3rem.