Sorry Michael. I must have... because now I have a different effect.
I made the change again, then went to one of the forms and selected white for the background color, then clicked "Save."
Then I reloaded the form. The instructions have reappeared, but now the background is a dark grey and the text is black.
Note: The H2 headings are blue, since I have them set to be blue in custom.css, if that makes any difference.
Here's the code after I changed it, copy and pasted it below:
{{if \IPS\Dispatcher::i()->application->directory === 'form'}}
<ul class="ipsToolList ipsToolList_horizontal ipsResponsive_hidePhone ipsClearfix">
{{if member.group['g_fs_view_logs']}}
<li class='ipsToolList_primaryAction'>
<a class="ipsButton ipsButton_medium ipsButton_important ipsButton_fullWidth" href="{url="app=form&controller=logs" seoTemplate="form_logs"}">
{lang="view_logs"}
</a>
</li>
{{endif}}
{{if !settings.fm_require_form}}
<li class='ipsToolList_primaryAction'>
<a class="ipsButton ipsButton_medium ipsButton_important ipsButton_fullWidth" href="{url="app=form&do=formlist" seoTemplate="form_list"}">
{lang="show_forms"}
</a>
</li>
{{endif}}
</ul>
{{endif}}
{{if \IPS\Dispatcher::i()->application->directory === 'form'}}
{template="pageHeader" group="global" app="core" params="$container->_title"}
{{else}}
{{endif}}
{{if $container->formTranslate( 'rules' )}}
<div class='ipsMessage ipsMessage_{{if isset( $container->_options->rules_color )}}{expression="$container->_options->rules_color"}{{else}}info{{endif}}' {{if isset( $container->_options->rules_color ) AND $container->_options->rules_color == 'none'}}style='color: #000;'{{endif}}>
{$container->formTranslate( 'rules', TRUE )|raw}
</div>
{{endif}}
<div class='ipsBox ipsPad'>
<div class='ipsType_normal ipsType_richText'>
{$form|raw}
</div>
</div>
Here's the effect: