Improve the look of tooltips (#7049)

src/components/views/elements/AccessibleTooltipButton.tsx

@@ -16,7 +16,6 @@ limitations under the License.
 */
 
 import React from 'react';
-import classNames from 'classnames';
 
 import AccessibleButton from "./AccessibleButton";
 import Tooltip, { Alignment } from './Tooltip';
@@ -70,13 +69,12 @@ export default class AccessibleTooltipButton extends React.PureComponent<IToolti
         // eslint-disable-next-line @typescript-eslint/no-unused-vars
         const { title, tooltip, children, tooltipClassName, forceHide, yOffset, alignment, ...props } = this.props;
 
-        const tip = this.state.hover ? <Tooltip
-            className="mx_AccessibleTooltipButton_container"
-            tooltipClassName={classNames("mx_AccessibleTooltipButton_tooltip", tooltipClassName)}
+        const tip = this.state.hover && <Tooltip
+            tooltipClassName={tooltipClassName}
             label={tooltip || title}
             yOffset={yOffset}
             alignment={alignment}
-        /> : null;
+        />;
         return (
             <AccessibleButton
                 {...props}