Example:

<div class="infusion-field" style="display: inline-block; width: 30%; padding-right: 5px;">
<input class="infusion-field-input" style="width:100%;" id="inf_field_LastName" name="inf_field_LastName" placeholder="Last Name *" type="text" />
</div>
&nbsp;

<div class="infusion-field" style="display: inline-block; width: 30%;">
<input class="infusion-field-input" style="width:100%;" id="inf_field_Email" name="inf_field_Email" placeholder="Email *" type="text" />
</div><br>