.flexContainer {_x000D_
display: flex;_x000D_
}_x000D_
_x000D_
.inputField {_x000D_
flex: 1;_x000D_
}
_x000D_
<div class="flexContainer">_x000D_
<input type="password" class="inputField">_x000D_
<button type="submit"><img src="arrow.png" alt="Arrow Icon"></button>_x000D_
</div>
_x000D_