Improve Browser Fallbacks

Tell us what’s happening:

Your code so far

  :root {
    --red-color: red;
  .red-box {
    background: var(--red-color,red);
    height: 200px;
<div class="red-box"></div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0.

Link to the challenge:

How would you add a rule for the background without knowing about variables? That’s what a browser that doesn’t support variables need

Don’t change the existing rule, that could make the tests not pass

did’t get what is this

I don’t get what you don’t get

Imagine you have never heard about variables, how do you set a background to red? that’s what this challenge wants from you and what browsers that don’t support variables need

i am still stuck in this topic ,
what is coding of this please tell me

I will not tell you the answer

Have you tried something? show me what you have tried

:root { --red-color: red; --black-color:black; } .red-box { background: var(--red-color,red); height: 200px; width:200px;}

Reset your code.

Now right above this line:
background: var(--red-color);

Set the background to red the way you would normally do it.

  .red-box {
    /* Set the background to red here */

    background: var(--red-color);
    height: 200px;

you don’t need to create a new variable - you have to add a background declaration that doesn’t use variables

1 Like

Thank you so much sir

I was having an issue with this challenge as well, however I had the proper answer, there cannot be a callback added behind the variable in order to pass the test. When I had a call back in the variable parentheses, it would still give me the same suggestion of adding a callback before the variable reference. Once i completely got rid of that and all the other edits I made, the challenge passed. I hope this helps anyone with my same issue!