Sass:Problem in "while" @while

Tell us what’s happening:
Why text-1 text-2 don’t work and other text pass?

Your code so far

<style type='text/sass'>
  @while $x < 11{
  .text-#{$x} {font-size:5px * $x;}
  $x:$x +1;

<p class="text-1">Hello</p>
<p class="text-2">Hello</p>
<p class="text-3">Hello</p>
<p class="text-4">Hello</p>
<p class="text-5">Hello</p>
<p class="text-6">Hello</p>
<p class="text-7">Hello</p>
<p class="text-8">Hello</p>
<p class="text-9">Hello</p>
<p class="text-10">Hello</p>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36.

Link to the challenge:

i tried it and it looks fine to me. idk what happening?