Responsive Coming soon page using grid and flexbox.

Yo! Sergio,

Congrats taking and completing the design.

Regarding to your input controls, there's no wrong in stacking one input control into another, and there's actually a better way you can achieve that same layout

Since both the input and the button share the same line, You should create a wrapper that'll group those elements.

<form>
  <div class="control-group">
    <label><input type="text" /></label>
    <button></button>
  </div>
</from>

Then instead of setting a position property to all input controls just set position: relative in div wrapper and set position: absolute in a button alone, and get rid of intentional setting the width: 100+% in the input