Vipin, thanks for helping geekingbr with the tweaks they wanted to make!
Please paste to following code at the end of your style.css file and save in order to change the border color of your search box.
I just wanted to mention that you should not add or change anything in your theme’s style.css file, or you will lose all your changes every time you update the theme to the latest version.
If you help other WordPress users, please don’t instruct them to modify their theme’s style.css or those folks are going to be in for an unpleasant surprise when they next update their theme. ??
geekingbr – if you haven’t gone one of these routes already, an easy way to add custom CSS is to install the Jetpack plugin and activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.
As alternatives, you could either install a standalone custom CSS plugin, or create a child theme.