How can I add a shadow behind a tooltip's triangular arrow without affecting the content in React?

Below is one common solution: create two layered pseudo‑elements so that the “shadow arrow” is drawn underneath a slightly smaller “white arrow.” This avoids relying on the drop‑shadow filter (which creates its own stacking context) and gives you full control over positioning and appearance.

Below is an example based on your code:

---

CSS:

CSSCopied
.toolTip-container {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-80%);
  padding: 10px;
  z-index: 1;
  width: 300px;
  box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.25);
  background-color: white;
  border-radius: 4px;
  font-family: "Roboto Flex";
  font-style: normal;
  font-weight: 400;
  font-size: 16px;
  line-height: 19px;
  color: #333333;
  text-align: center;
}

/* Create the arrow shadow */
.toolTip-container::before {
  content: "";
  position: absolute;
  /* Position the shadow arrow just above the content */
  bottom: 100%;
  left: 75%;
  transform: translateX(-50%);
  border-width: 29px;
  border-style: solid;
  /* Make the arrow triangle with transparent sides and a shadow color at the bottom */
  border-left: 19px solid transparent;
  border-right: 19px solid transparent;
  border-color: transparent transparent rgba(0, 0, 0, 0.25) transparent;
  z-index: 0;
}

/* Create the actual white arrow on top of the shadow */
.toolTip-container::after {
  content: "";
  position: absolute;
  /* Slightly offset upward so that the shadow can peek out */
  bottom: calc(100% - 4px);
  left: 75%;
  transform: translateX(-50%);
  border-width: 29px;
  border-style: solid;
  border-left: 19px solid transparent;
  border-right: 19px solid transparent;
  /* White arrow */
  border-color: transparent transparent white transparent;
  z-index: 1;
}

---

React Component:

JAVASCRIPTCopied
function Example() {
  return <ToolTip text="Example text" />;
}

function ToolTip({ text }) {
  return (
    <div className="toolTip-container">
      {text}
    </div>
  );
}

---

Explanation

1. Two Pseudo‑elements:

   • The ::before pseudo‑element creates an arrow “shadow” with slightly larger dimensions (or positioned the same but not overlapping completely).
   • The ::after pseudo‑element creates the white arrow, positioned 4px lower (using calc(100% - 4px)) so that the shadow is visible underneath.

2. Stacking Order:

   • Using z-index ensures that the shadow (z-index: 0) is painted behind the white arrow (z-index: 1).

3. Alignment:

   • The left: 75% and transform: translateX(-50%) rules position the tip of the arrow roughly where you want it. You can adjust these percentages to fine-tune the arrow’s alignment relative to your tooltip content.

This approach gives you a consistent shadow for both the tooltip content and the arrow without running into issues with the drop‑shadow filter covering the tooltip content. Feel free to adjust border widths, colors, and offsets to best match your design requirements.