.frm{top:-.25em;right:-.25em;bottom:-.25em;left:-.25em;color:red;border:solid .05em;background:
url(../mask/corner10a.svg)0 0/.9em border-box,
url(../mask/corner10b.svg)100% 0/.9em border-box,
url(../mask/corner10c.svg)100% 100%/.9em border-box,
url(../mask/corner10d.svg)0 100%/.9em border-box;
background-repeat:no-repeat;
filter:drop-shadow(0 0 .2px)brightness(.7)url(#lightA2)url(#edgeClean)}