var selectedOddElements = $("p.myClass:odd");<header>
<div class="header_btn_wrapper">
<div class="flex_btn">
<input type="text" placeholder="111111">
<input type="text" placeholder="111111">
</div>
</div>
<div class="header_background">
<img src=".......">
</div>
</header><h1> у меня <img> в dive - <header>
<div class="flex-header-conteiner">
<div class="flex-image">
<img src="img/header_img.png" alt="header">
</div>
<div class="flex-btn">
<input type="text" placeholder="Логин">
<input type="text" placeholder="Пароль">
<input type="submit" value="вход">
</div>
</div>
</header>
