a {
  background-image: linear-gradient(rgb(255,0,0));
  border-image-source: repeating-linear-gradient(rgb(255,0,0));
}

b {
  background-image: linear-gradient(to top, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to top, rgb(255,0,0));
}

c {
  background-image: linear-gradient(rgb(255,0,0));
  border-image-source: repeating-linear-gradient(rgb(255,0,0));
}

d {
  background-image: linear-gradient(to left, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to left, rgb(255,0,0));
}

e {
  background-image: linear-gradient(to right, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to right, rgb(255,0,0));
}

f {
  background-image: linear-gradient(to bottom left, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to bottom left, rgb(255,0,0));
}

g {
  background-image: linear-gradient(to bottom right, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to bottom right, rgb(255,0,0));
}

h {
  background-image: linear-gradient(to top right, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to top right, rgb(255,0,0));
}

i {
  background-image: linear-gradient(to bottom left, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(to bottom left, rgb(255,0,0));
}

j {
  background-image: linear-gradient(1turn, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(1turn, rgb(255,0,0));
}

k {
  background-image: linear-gradient(-0.25turn, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(-0.25turn, rgb(255,0,0));
}

l {
  background-image: linear-gradient(3.125deg, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(3.125deg, rgb(255,0,0));
}

m {
  background-image: linear-gradient(90rad, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(90rad, rgb(255,0,0));
}

n {
  background-image: linear-gradient(-100grad, rgb(255,0,0));
  border-image-source: repeating-linear-gradient(-100grad, rgb(255,0,0));
}

o {
  background-image: linear-gradient(rgb(255,0,0), rgb(0,255,0), rgb(0,0,255));
  border-image-source: repeating-linear-gradient(rgb(255,0,0), rgb(0,255,0), rgb(0,0,255));
}

p {
  background-image: linear-gradient(rgb(255,0,0) -50%, rgb(0,255,0), rgb(0,0,255) 150%);
  border-image-source: repeating-linear-gradient(rgb(255,0,0) -50%, rgb(0,255,0), rgb(0,0,255) 150%);
}

q {
  background-image: linear-gradient(rgb(255,0,0) -50%, rgb(0,255,0), rgb(0,0,255) 150%);
  border-image-source: repeating-linear-gradient(rgb(255,0,0) -50%, rgb(0,255,0), rgb(0,0,255) 150%);
}

r {
  background-image: linear-gradient(rgb(255,0,0) 1px, rgb(0,255,0) 2em);
  border-image-source: repeating-linear-gradient(rgb(255,0,0) 1px, rgb(0,255,0) 2em);
}

s {
  background-image: linear-gradient(rgb(255,0,0), rgb(0,255,0) 2px, rgb(0,0,255));
  border-image-source: repeating-linear-gradient(rgb(255,0,0), rgb(0,255,0) 2px, rgb(0,0,255));
}

t {
  background-image: linear-gradient(rgb(255,0,0), rgb(0,255,0), rgb(0,0,255), rgb(160,32,240), rgb(255,192,203), rgb(255,255,0), rgb(0,0,0), rgb(255,165,0));
  border-image-source: repeating-linear-gradient(rgb(255,0,0), rgb(0,255,0), rgb(0,0,255), rgb(160,32,240), rgb(255,192,203), rgb(255,255,0), rgb(0,0,0), rgb(255,165,0));
}

u {
  background-image: linear-gradient(rgb(255,0,0) -5px, rgb(0,255,0) 20em, rgb(0,0,255), rgb(160,32,240) -42%, rgb(255,192,203) 3pt);
  border-image-source: repeating-linear-gradient(rgb(255,0,0) -5px, rgb(0,255,0) 20em, rgb(0,0,255), rgb(160,32,240) -42%, rgb(255,192,203) 3pt);
}