When widget Input text color same as background
Not all theme works well with 3rd parties plugin widget. Text and background color might be the same and difficult to read.

Invisible text and cursor
Text input and cursor has same color as background

Finished input
Default text blended into bacground
Below CSS code will help to address the visibility issue.
footer .widget-item #s:focus,
#footer.dark-style .widget-item input[type=email]:focus,
#footer.dark-style .widget-item input[type=text]:focus,
#footer.dark-style .widget-item textarea:focus {
color: #0c0c0c;
}
input[type=text], textarea, input[type=email], input[type=password], input[type=tel], input[type=url], input[type=date], input[type=search], select {
background-color: rgba(226, 226, 226, 0.99);
}

After CSS applied
Cursor and all text are shown

Result
All text are visible
Add this to your site “Custom CSS” box in theme options.