Remove Border Shadow Around Form

I've searched several questions previously asked and have injected different CSS into forms and it appears nothing changes.

Red arrow: How can I remove the border/shadow around the entire form?

Hi,

You can inject CSS code for box shadows. Here's sample code: 

.form-all {

-webkit-box-shadow: none !important;

box-shadow: none !important;

}

Thanks

Thank you. I've updated and it worked. An hour later I returned to the webpage where my form is located and it seems the effects have worn off. I went back to the inject CSS code and it was gone. I re-entered it and it again did what is was supposed to do.

Is it normal for the coding to become void without me physically removing it myself?

Glad to know it worked. That's odd, maybe the form did not  properly save: 

Let us know if this happens again.