Push simulated cursor (I'll ask for design help next)

app/assets/stylesheets/animation.css

@@ -50,4 +50,10 @@
   @keyframes zoom-fade {
     100% { transform: translateY(-1.5em); scale: 2; opacity: 0; }
   }
+
+  @keyframes blink {
+    50% {
+      border-color: transparent;
+    }
+  }
 }

app/assets/stylesheets/rich-text-content.css

@@ -363,4 +363,14 @@
       --attachment-text-color: var(--color-ink-inverted);
     }
   }
+
+  [data-lexical-cursor] {
+    height: 1lh;
+    border-left: 1px solid black;
+    animation: blink 1s step-end infinite;
+
+    p & {
+      display: inline-block;
+    }
+  }
 }