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HTML 

              
                <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css" integrity="sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin="anonymous">
<div id="app"></div>
!

CSS 

              
                html, body, #app {
  height: 100%;
}

.container {
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(to left, #3182d5, #4e54c8);
  
  h3 {
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
    color: #ffffff;
    font-size: 6vw;
    
    @media(min-width: 768px) {
      font-size: 5vw;
    }
    
     @media(min-width: 992px) {
      font-size: 3vw;
    }
  }
}

//toggle nav styles
.toggle-nav {
  position: fixed;
  z-index: 10;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
  transition: all 0.2s ease; 

  button {
    border-radius: 50%;
    border: none;
    outline: none;
    cursor: pointer;
    min-width: 40px;
    min-height: 40px;
    padding: 13px;
    position: absolute;
    opacity: 0.9;
    
    &.main-button {
      z-index: 20;
    }
    
    &.sub-button {
      opacity: 0;
      background-color: #d41672;
      color: #ffffff;
    }
  }
}
!

JS 

              
                const { Component, Fragment } = React;

class ToggleNav extends Component {
  componentDidMount() {
    this.setState({isHasTouch: this.hasTouch()})
  }
  state = {
    isHover: false,
    isHasTouch: false,
  };

  radius = 25;

  //check whether the current device has touch screen or not
  hasTouch = () => {
    return (
      "ontouchstart" in document.documentElement ||
      navigator.maxTouchPoints > 0 ||
      navigator.msMaxTouchPoints > 0
    );
  };

  setNavigatorLocattion = () => {
    const { location, buttons } = this.props,
      buttonsLength = buttons.length;

    switch (location) {
      case "top-left":
        return {
          container: {
            top: 10,
            right: "auto",
            bottom: "auto",
            left: 10
          },
          mainButton: {
            top: 0,
            right: "auto",
            bottom: "auto",
            left: 0
          }
        };
      case "top-right":
        return {
          container: {
            top: 10,
            right: 10,
            bottom: "auto",
            left: "auto"
          },
          mainButton: {
            top: 0,
            right: 0,
            bottom: "auto",
            left: "auto"
          }
        };
      case "bottom-left":
        return {
          container: {
            top: "auto",
            right: "auto",
            bottom: 10,
            left: 10
          },
          mainButton: {
            top: "auto",
            right: "auto",
            bottom: 0,
            left: 0
          }
        };
      default:
        return {
          container: {
            top: "auto",
            right: 10,
            bottom: 10,
            left: "auto"
          },
          mainButton: {
            top: "auto",
            right: 0,
            bottom: 0,
            left: "auto"
          }
        };
    }
  };

  // (x, y) = (r * cos(θ), r * sin(θ))
  setButtonPostion = (index) => {
    const { location, buttons } = this.props,
      buttonsLength = buttons.length,
      circleRadius = this.radius * buttonsLength;
    switch (location) {
      case "top-left":
        return {
          top: Math.round(
            circleRadius * Math.sin((Math.PI / 2 / (buttonsLength - 1)) * index)
          ),
          right: "auto",
          bottom: "auto",
          left: Math.round(
            circleRadius * Math.cos((Math.PI / 2 / (buttonsLength - 1)) * index)
          )
        };
      case "top-right":
        return {
          top: Math.round(
            circleRadius * Math.sin((Math.PI / 2 / (buttonsLength - 1)) * index)
          ),
          right: Math.round(
            circleRadius * Math.cos((Math.PI / 2 / (buttonsLength - 1)) * index)
          ),
          bottom: "auto",
          left: "auto"
        };
      case "bottom-left":
        return {
          top: "auto",
          right: "auto",
          bottom: Math.round(
            circleRadius * Math.sin((Math.PI / 2 / (buttonsLength - 1)) * index)
          ),
          left: Math.round(
            circleRadius * Math.cos((Math.PI / 2 / (buttonsLength - 1)) * index)
          )
        };
      default:
        return {
          top: "auto",
          right: Math.round(
            circleRadius * Math.cos((Math.PI / 2 / (buttonsLength - 1)) * index)
          ),
          bottom: Math.round(
            circleRadius * Math.sin((Math.PI / 2 / (buttonsLength - 1)) * index)
          ),
          left: "auto"
        };
    }
  };

  mouseEnterHandler = () => {
    this.setState({ isHover: true });
  };

  mouseLeaveHanlder = () => {
    this.setState({ isHover: false });
  };

  clickHandler = (handler) => {
    this.mouseLeaveHanlder();
    handler();
  };

  render() {
    //set condition for buttons array length to be at least 2
    const { isHover, isHasTouch } = this.state,
      { buttons, mainButtonIcon } = this.props,
      buttonsLength = buttons.length,
      circleRadius = this.radius * buttonsLength,
      navigatorDimensions = this.radius * buttonsLength * 1.6,
      { container, mainButton } = this.setNavigatorLocattion();
    return (
      <Fragment>       
        {buttonsLength > 1 ? (
          <div
            onMouseEnter={!isHasTouch ? this.mouseEnterHandler : () => {}}
            onMouseLeave={!isHasTouch ? this.mouseLeaveHanlder : () => {}}         
            className="toggle-nav"
            style={{
              top: container.top,
              right: container.right,
              bottom: container.bottom,
              left: container.left,
              width: isHover ? navigatorDimensions : 40,
              height: isHover ? navigatorDimensions : 40
            }}
          >
            <button
              className="main-button"
              style={{
                top: mainButton.top,
                right: mainButton.right,
                bottom: mainButton.bottom,
                left: mainButton.left
              }}
              onClick={isHasTouch ? this.mouseEnterHandler : () => {}}
            >
              {mainButtonIcon}
            </button>
            {buttons.map((el, i) => (
              <Fragment key={i}>
                <button
                  className="sub-button"
                  style={{
                    opacity: isHover ? 0.9 : 0,
                    top: isHover
                      ? this.setButtonPostion(i).top
                      : this.setButtonPostion(i).top === "auto"
                      ? "auto"
                      : 0,
                    right: isHover
                      ? this.setButtonPostion(i).right
                      : this.setButtonPostion(i).right === "auto"
                      ? "auto"
                      : 0,
                    bottom: isHover
                      ? this.setButtonPostion(i).bottom
                      : this.setButtonPostion(i).bottom === "auto"
                      ? "auto"
                      : 0,
                    left: isHover
                      ? this.setButtonPostion(i).left
                      : this.setButtonPostion(i).left === "auto"
                      ? "auto"
                      : 0,
                    transition: `all 0.2s 0.${i + 1}s ease`
                  }}
                  onClick={() => this.clickHandler(el.click)}
                >
                  {el.icon}
                </button>
              </Fragment>
            ))}
          </div>
        ) : (
          <div
            className="toggle-nav"
            style={{
              top: container.top,
              right: container.right,
              bottom: container.bottom,
              left: container.left,
              width: 150
            }}
          >
            Must be more than one button
          </div>
        )}
      </Fragment>
    );
  }
}

ToggleNav.propTypes = {
  location: PropTypes.string,
  buttons: PropTypes.array.isRequired,
  mainButtonIcon: PropTypes.node.isRequired
};

const App = () => {
	const buttons = [
		{
			icon: <i className="fas fa-home"/>,
			click: () => console.log('clicked'),
		},
		{
			icon: <i className="fas fa-briefcase"/>,
			click: () => console.log('clicked'),
		},
		{ icon: <i className="fas fa-phone"/>, click: () => console.log('clicked') },
	];

	return (
		<div className="container">
      <h3>Hover over the buttons</h3>
      {/*ToggleNav properties:
      - location: default => (bottom-right) available locations => (top-left, top-right, bottom-left, bottom-right)
      - buttons: array of buttons
      - mainButtonIcon: icon of the main button */}
			<ToggleNav
				location="top-left"
				buttons={buttons}
				mainButtonIcon={<i className="fas fa-info" />}
			/>
			<ToggleNav
				location="top-right"
				buttons={buttons}
				mainButtonIcon={<i className="fas fa-info" />}
			/>
			<ToggleNav
				location="bottom-left"
				buttons={buttons}
				mainButtonIcon={<i className="fas fa-info" />}
			/>
			<ToggleNav
				location="bottom-right"
				buttons={buttons}
				mainButtonIcon={<i className="fas fa-info" />}
			/>
		</div>
	);
};

ReactDOM.render(<App />, document.querySelector('#app'));
!
999px

Console