fix: Ensure search field visibility in response panel

[Nithishvb]

Description

Fixes: #3381

This PR addresses an issue where the search field was not visible when using the Command/Ctrl+F shortcut in the response panel.

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• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
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[tlaloc911]

I would suggest to use theme's colors in order to match with selected theme

.CodeMirror-search-field{
position: absolute;
bottom: 0;
margin-bottom: 10px;
color: ${(props) => props.theme.colors.text};
background: ${(props) => props.theme.modal.input.bg};
}