CSS Outline
<!DOCTYPE html> <html> <head> <style> .field { outline: 2px solid #00643c; outline-offset: 4px; } </style> </head> <body> <input class="field" type="text" value="Phone number"> </body> </html>
<!DOCTYPE html> <html> <head> <style> .field { outline: 2px solid #00643c; outline-offset: 4px; } </style> </head> <body> <input class="field" type="text" value="Phone number"> </body> </html>