.frm{top:-.29em;right:-.29em;bottom:-.29em;left:-.29em;color:#444}
.frm:before{border-width:.3em;filter:url(#marble)drop-shadow(3px 3px 2px rgba(0,0,0,.6))}
.frm:after{border-width:.16em;filter:url(#marble)url(#bevel)}
.frm p:after{background:
linear-gradient(to bottom left,transparent 49%,currentColor 50%,transparent 51%),
linear-gradient(to bottom right,transparent 49%,currentColor 50%,transparent 51%)100% 0,
linear-gradient(to left bottom,transparent 49%,currentColor 50%,transparent 51%)100% 100%,
linear-gradient(to right bottom,transparent 49%,currentColor 50%,transparent 51%)0 100%;
background-repeat:no-repeat;background-size:.3em .3em}