support for jstris skin as well

css/tetrio-skin.css

@@ -0,0 +1,55 @@
+:root {
+  --cell-size: 30px;
+  --sprite-size: calc(100% / 11);
+  --skin-url: url(https://you.have.fail/ed/at/tetrioplus/data/content/skin/Haley%20Halcyon/tetrio_gameboy_plus.svg);
+}
+
+.mino {
+  width: var(--cell-size);
+  height: var(--cell-size);
+  background-image: var(--skin-url);
+  background-size: cover;
+  background-repeat: no-repeat;
+  background-position-x: calc(var(--sprite-pos) * var(--sprite-size));
+}
+
+.I {
+    --sprite-pos: 4;
+}
+
+.J {
+    --sprite-pos: 5;
+}
+
+.L {
+    --sprite-pos: 1;
+}
+
+.O {
+    --sprite-pos: 2;
+}
+
+.S {
+    --sprite-pos: 3;
+}
+
+.T {
+    --sprite-pos: 6;
+}
+
+.Z {
+    --sprite-pos: 0;
+}
+
+.ghost {
+  --sprite-pos: 7;
+  opacity: 50%;
+}
+
+.disabled {
+  --sprite-pos: 8;
+}
+
+.locking.mino {
+    filter: saturate(60%) brightness(180%);
+}