template/form/control/lookup.html
<div {$attributes}>
{$BeforeInput}{$AfterBeforeInput}
<div class="ui dropdown {$multipleClass} search selection {$disabledClass}" style="width: 100%;">
{$Input}
<i class="dropdown icon"></i>
<input class="search" value="{$value}" {$disabled} style="width: 100%;">
<div class="default text">{$placeholder}</div>
</div>
{$AfterInput}{$AfterAfterInput}
</div>