feat: lg shadow with less opacity

[alfonsobries]

Summary

Related to https://app.clickup.com/t/mb5pj7 and ArkEcosystem/explorer#835

Add a new lg shadow with less opacity for the search module on explorer

Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my (code) changes for obvious issues, debug statements and commented code
• I provided a screenshot of my changes to the component (if applicable)
• I regenerated the icons.html file and checked if my newly added icon is shown correctly (if necessary)
• I added an explanation on how to use the component to the readme (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged