I'm confused why my existing span and new spans not working

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

      <span class="flex">
      <span>
      <span>
      </span>

Hi @fort.baguio

Base in what I am seeing you should check your elements syntax.

<element></element>
<element></element>
// or nested one
<element>
  <element></element>
</element>

If you dont close the first element before the second one the browser think you just have one from line 1 to 4.
I hope that helps but try to give more information to other people, like error message, more specific questions and the link your current step.
Happy coding!