gradientowe ramki

http://www.hongkiat.com/blog/css-gradient-border/


padding: 2rem 2rem 0.6rem 2rem;
background: repeating-linear-gradient(45deg, transparent, transparent 25px, gray 25px, gray 50px);
border: 5px solid #fff;
border-image-source: linear-gradient(45deg, #008f68, #fae042);
border-image-slice: 1;