feat: Fixed at corner

styles/patterns/_fixed-at-corner.scss

@@ -0,0 +1,32 @@
+.fixed-at-corner {
+    width: 100%;
+    height: 100%;
+    border: 1px solid rgba(0, 0, 0, .3);
+    border-radius: 0.25rem;
+
+    position: relative;
+}
+
+.fixed-at-corner__corner {
+    position: absolute;
+}
+
+.fixed-at-corner__corner--tl {
+    left: 0;
+    top: 0;
+}
+
+.fixed-at-corner__corner--tr {
+    top: 0;
+    right: 0;
+}
+
+.fixed-at-corner__corner--br {
+    bottom: 0;
+    right: 0;
+}
+
+.fixed-at-corner__corner--bl {
+    bottom: 0;
+    left: 0;
+}