Search Box radius

I want to find the css for the 'Search Box' in header to stylize for mobiles. can someone point me to the file?

after 45 mins searching, I might require collective wisdom

Lol! Search.tpl? Maybe. I am mobile. But I believe it is search.tpl. did I already tell you about adding bootstrap to the class?

not there, in fact I checked _header_search.tpl, tried some codes, and nothing

I found this on _header_search.tpl

<div class="search-wrapper d-none d-md-block">
  <form>
    <input id="search-input" type="text" class="form-control" placeholder='{__("Search")}' autocomplete="off">
    <div class="search-input-icon">
      {include file='__svg_icons.tpl' icon="header-search" class="header-icon" width="20px" height="20px"}
    </div>

search.tpl is for the Search Page, not header

Philippians 4:13

<input id="search-input" type="text" class="form-control rounded-pill" placeholder='{__("Search")}' autocomplete="off">

This forum is a ghost without notificartions and sice I updated yesterday notifications was removed,, just added it back lol... sorry