🪲[Bug]: Theme card issue

**Describe the bug**
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@akshitagupta15june

check this out,
when i change the theme card's background still white

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'About ' page and try to change theme

**Expected behavior**
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**Screenshots**
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**Desktop (please complete the following information):**
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]

**Additional context**
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