Change Required field Error Background Color

I'm trying to change the background color of a field, which changes after the user clicks off of a required field without filling it out. I've inserted the following code into the CSS, but it doesn't seem to be helping. 

.form-line-error{
background-color: #black !important;
}

I either need to have the background remain black, or have the text turn to black. 

Please try inject the following CSS code to your JotForm to change the background color of error message to black and text color to white.

.form-error-arrow-inner {

    border-bottom-color : #000000;

}

.form-line-error .form-error-message {

    background-color : #000000;

    color : #FFF;

}

.form-line-error {

    background-color : #D3D3D3;

}

By injecting the above CSS to your JotForm, the error message is displayed as below :

Hope this information helps.