:root {
    --backgroundColor: #f5f5f5;
    --textColor: #000000;
    --primaryColor: #333333;

    --highlightColor: var(--blue);

    --heartRed: #dc3545;
    --phoneColor: #494f54;
    --phoneColorDark: #25282b;
    --screenColor: #f5f5f5;
    --screenColorDark: #e8e8e8;

    --fontFamilySansSerif: -apple-system, BlinkMacSystemFont, "Segoe UI", "Ubuntu", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --fontFamilyMonospace: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --fontSize: 1em;
}

html.dark {
    --backgroundColor: #1a1a1a;
    --textColor: #ffffff;
    --primaryColor: #cccccc;
}

:root {
    --backgroundColor: white;
    --textColor: black;
    --primaryColor: #333333;

    --highlightColor: var(--blue);

    --heartRed: #dc3545;
    --phoneColor: #494f54;
    --phoneColorDark: #25282b;
    --screenColor: #f5f5f5;
    --screenColorDark: #e8e8e8;

    --fontFamilySansSerif: -apple-system, BlinkMacSystemFont, "Segoe UI", "Ubuntu", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --fontFamilyMonospace: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --fontSize: 1em;
}

html.dark {
    --backgroundColor: #1a1a1a;
    --textColor: white;
    --primaryColor: #cccccc;
}

Adjust white theme background to real white
Adjust white theme background to real white