hi anon! i used a border from /horrere, i recommend looking on there or /up if you have trouble finding borders - if you were wondering about how i made it appear, then i used metadata. here's the metadata thing i used :3c

CONTAINER_BORDER_IMAGE = [direct link to your border]
CONTAINER_BORDER_IMAGE_SLICE = 20
CONTAINER_BORDER_IMAGE_WIDTH = 13px
CONTAINER_BORDER_IMAGE_OUTSET = 10px
CONTAINER_BORDER_IMAGE_REPEAT = repeat

i hope this answers your question, anon!