style: Add title card background color

content/tools/services/vpn/index.md

@@ -39,6 +39,8 @@ Our recommended providers use encryption, support WireGuard & OpenVPN, and have
 
 ### Proton VPN
 
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 **Proton VPN** is a strong contender in the VPN space, and they have been in operation since 2016. Proton AG is based in Switzerland and offers a limited free tier, as well as a more featured premium option.
 
 {{< cards >}}
@@ -46,6 +48,8 @@ Our recommended providers use encryption, support WireGuard & OpenVPN, and have
   {{< card link="https://protonvpn.com/privacy-policy" title="Privacy Policy" icon="eye" >}}
 {{< /cards >}}
 
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 [{{< badge content="Linux" color="yellow" >}}](https://protonvpn.com/support/linux-vpn-setup)
 [{{< badge content="macOS" color="indigo" >}}](https://protonvpn.com/download-macos)
 [{{< badge content="Windows" color="red" >}}](https://protonvpn.com/download-windows)
@@ -116,6 +120,8 @@ Additionally, system crashes [may occur](https://protonvpn.com/support/macos-t2-
 
 ### IVPN
 
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 **IVPN** is another premium VPN provider, and they have been in operation since 2009. IVPN is based in Gibraltar and does not offer a free trial.
 
 {{< cards >}}
@@ -123,6 +129,8 @@ Additionally, system crashes [may occur](https://protonvpn.com/support/macos-t2-
   {{< card link="https://ivpn.net/privacy" title="Privacy Policy" icon="eye" >}}
 {{< /cards >}}
 
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 [{{< badge content="Linux" color="yellow" >}}](https://ivpn.net/apps-linux)
 [{{< badge content="macOS" color="indigo" >}}](https://ivpn.net/apps-macos)
 [{{< badge content="Windows" color="red" >}}](https://ivpn.net/apps-windows)
@@ -180,6 +188,8 @@ IVPN clients support two-factor authentication. IVPN also provides "[AntiTracker
 
 ### Mullvad
 
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 **Mullvad** is a fast and inexpensive VPN with a serious focus on transparency and security. They have been in operation since 2009. Mullvad is based in Sweden and offers a 14-day money-back guarantee for [payment methods](https://mullvad.net/en/help/refunds) that allow it.
 
 {{< cards >}}
@@ -187,6 +197,8 @@ IVPN clients support two-factor authentication. IVPN also provides "[AntiTracker
   {{< card link="https://mullvad.net/en/help/privacy-policy" title="Privacy Policy" icon="eye" >}}
 {{< /cards >}}
 
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 [{{< badge content="Linux" color="yellow" >}}](https://mullvad.net/en/download/linux)
 [{{< badge content="macOS" color="indigo" >}}](https://mullvad.net/en/download/macos)
 [{{< badge content="Windows" color="red" >}}](https://mullvad.net/en/download/windows)