box shadow border only show left side
<style> .box-4 { box-shadow: 5px 0 5px -5px rgba(0,0,0,0.7), -5px 0 10px -5px rgba(0,0,0,0.7); } </style>
Source: pixelbrewco.com
<style> .box-4 { box-shadow: 5px 0 5px -5px rgba(0,0,0,0.7), -5px 0 10px -5px rgba(0,0,0,0.7); } </style>