<!doctype html> <html> <head> <meta charset="utf-8"> <style> .bar { width: 400px; height: 100px; } .box { display: inline-block; width: 100px; height: 100px; border: 0px; background-image: linear-gradient(to bottom left, red 50%, transparent 50%); } </style> </head> <body> <div class="bar"> <div class="box"></div><div class="box"></div><div class="box"></div><div class="box"></div> </div> <div class="bar"> <div class="box"></div><div class="box"></div><div class="box"></div><div class="box"></div> </div> </body> </html>