Running tests not working

After I complete a task, my new computer I just bought tonight won’t move on to the next one. It’s like it’s completely ignoring that I hit the run tests button. Works fine on my cell phone.

Hello , i have the same problem with one question and since the update ! i know this answer, it’s very easy but impossible to validate !!! please help me to debug this page ! add it make bug my computer
https://www.freecodecamp.org/learn/responsive-web-design/basic-css/understand-absolute-versus-relative-units.red-box {
background-color: red;
margin: 20px 40px 20px 40px;
padding : 1.5em;
}
FIREFOX DEVELOPER EDITION ON WINDOWS 10
I have the problem only on this question and since the Update (i was on this when it’s started)

if you answer to Randell’s Questions in the last post maybe we can help

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