CSS Tooltip

CSS Tooltip

A CSS tooltip is used to specify extra information about something when the user moves the mouse pointer over an element:

CSS Create a Basic Tooltip

Create a tooltip that appears when the user moves the mouse over an element:

Example Explained

HTML:

• Use a container element (like <div>) and add the "tooltip" class to it. When the user mouse over this <div>, it will show the tooltip text.
• The tooltip text is placed inside an inline element (like <span>) with class="tooltiptext".

CSS:

• The tooltip class use position:relative, which is needed to position the tooltip text (position:absolute). Tip: See examples below on how to position the tooltip.
• The tooltiptext class holds the actual tooltip text. It is hidden by default, and will be visible on hover.
• The :hover selector is used to show the tooltip text when the user moves the mouse over the <div> with class="tooltip".

Positioning the Tooltip

You can position the tooltip as you like. Here we will show how to position the tooltip to the left, right, top and bottom.

Right- and Left-aligned Tooltip

In this example, the tooltip is placed to the right (left:105%) of the "hoverable" text (<div>). Also note that top:-5px is used to place it in the middle of its container element. We use the number 5 because the tooltip text has a top and bottom padding of 5px. If you increase its padding, also increase the value of the top property to ensure that it stays in the middle (if this is something you want). The same applies if you want the tooltip placed to the left.

Top- and Bottom-aligned Tooltip

If you want the tooltip to appear on top or on the bottom, see examples below. Note that we use the margin-left property with a value of minus 65 pixels. This is to center the tooltip above/below the hoverable text. It is set to the half of the tooltip's width (130/2 = 65).

Tooltip Arrows

To create an arrow that should appear from a specific side of the tooltip, add "empty" content after tooltip, with the pseudo-element class ::after together with the content property. The arrow itself is created using borders. This will make the tooltip look like a speech bubble.

This example demonstrates how to add an arrow to the bottom of the tooltip:

Example Explained

Position the arrow inside the tooltip: top: 100% will place the arrow at the bottom of the tooltip. left: 50% will center the arrow.

Note: The border-width property specifies the size of the arrow. If you change this, also change the margin-left value to the same. This will keep the arrow centered.

The border-color is used to transform the content into an arrow. We set the top border to black, and the rest to transparent. If all sides were black, you would end up with a black square box.

This example demonstrates how to add an arrow to the top of the tooltip. Notice that we set the bottom border color this time:

This example demonstrates how to add an arrow to the left of the tooltip:

This example demonstrates how to add an arrow to the right of the tooltip:

Fade-in Tooltip

If you want a tooltip that fades in, use the CSS transition property and the opacity property, and go from being completely invisible to 100% visible, in a number of specified seconds (2 second in our example):