To change the font size of a menu using CSS, you can use the font-size property. Here's an example:

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.menu {
  font-size: 18px;
}

In this example, the class .menu is being used to select the menu element that you want to change the font size for. The font-size property is then set to 18px. You can adjust the 18px value to any size that you want.

Here's a link to the Mozilla Developer Network (MDN) documentation on the font-size property: https://developer.mozilla.org/en-US/docs/Web/CSS/font-size

Here's an example code for a burger menu component that uses React.js and TailwindCSS:

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import React, { useState } from "react";
import { Transition } from "@headlessui/react";
import { MenuIcon, XIcon } from "@heroicons/react/outline";

const Nav = () => {
  const [isOpen, setIsOpen] = useState(false);

  return (
    <nav className="flex items-center justify-between flex-wrap bg-gray-800 p-6">
      <div className="flex items-center flex-shrink-0 text-white mr-6">
        <span className="font-semibold text-xl tracking-tight">Burger Menu</span>
      </div>
      <div className="block lg:hidden">
        <button
          onClick={() => setIsOpen(!isOpen)}
          className="flex items-center px-3 py-2 border rounded text-teal-200 border-teal-400 hover:text-white hover:border-white"
        >
          {isOpen ? (
            <XIcon className="h-6 w-6" aria-hidden="true" />
          ) : (
            <MenuIcon className="h-6 w-6" aria-hidden="true" />
          )}
        </button>
      </div>
      <Transition
        show={isOpen}
        enter="transition duration-200 ease-out"
        enterFrom="opacity-0 scale-95"
        enterTo="opacity-100 scale-100"
        leave="transition duration-200 ease-in"
        leaveFrom="opacity-100 scale-100"
        leaveTo="opacity-0 scale-95"
      >
        {(ref) => (
          <div
            ref={ref}
            className="w-full block flex-grow lg:flex lg:items-center lg:w-auto"
          >
            <div className="text-sm lg:flex-grow">
              <a
                href="#responsive-header"
                className="block mt-4 lg:inline-block lg:mt-0 text-teal-200 hover:text-white mr-4"
              >
                Link 1
              </a>
              <a
                href="#responsive-header"
                className="block mt-4 lg:inline-block lg:mt-0 text-teal-200 hover:text-white mr-4"
              >
                Link 2
              </a>
              <a
                href="#responsive-header"
                className="block mt-4 lg:inline-block lg:mt-0 text-teal-200 hover:text-white"
              >
                Link 3
              </a>
            </div>
          </div>
        )}
      </Transition>
    </nav>
  );
};

export default Nav;

This code defines a Nav component that contains a burger menu that opens and closes when a button is clicked. The MenuIcon and XIcon components are imported from @heroicons/react/outline, and they are used to show and hide the menu when the button is clicked.

The burger menu is created using TailwindCSS classes, and the Transition component from @headlessui/react is used to animate the menu when it opens and closes.

Inside the Transition component, there's a div that contains the links for the menu. You can replace the links with your own links or components as needed.

To create a horizontal responsive menu in HTML, you can use a combination of HTML and CSS. Here's an example using HTML and CSS:

HTML code:

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<header>
  <nav>
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Services</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>
</header>

CSS code:

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header {
  background-color: #333;
  color: #fff;
  padding: 10px;
}

nav {
  display: flex;
}

ul {
  display: flex;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

li {
  margin: 0 10px;
}

a {
  color: #fff;
  text-decoration: none;
}

In this example, we first define a header element with a navigation element inside. Inside the navigation element, we define an unordered list (ul) with four list items (li) that contain anchor elements (a) for the menu links.

In the CSS code, we define the header background color and text color. We then set the display for the nav element to flex to create a horizontal layout for the menu. For the ul element, we set the display to flex and remove the default margin and padding. For the li element, we set a margin of 0 and a margin of 10px between each list item. Finally, we set the anchor element color to white and remove the underline using the text-decoration: none property.

Here's a link to a CodePen example: https://codepen.io/shecodes_abby/pen/ExKjpwV

To access emojis on your keyboard, you can usually look for a smiley face or globe icon on your keyboard. Tap on it and it will pull up an emoji menu. If your device does not have an emoji keyboard, you can try holding down the 'enter' button on your keyboard to access an emoji menu or download third-party keyboard apps that provide access to emojis.

HTML:

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<!DOCTYPE html>
<html>
   <head>
      <title>Restaurant Website</title>
      <link rel="stylesheet" href="style.css">
   </head>
   <body>
      <header>
         <nav>
            <ul>
               <li><a href="#">Menu</a></li>
               <li><a href="#">Order</a></li>
               <li><a href="#">Location</a></li>
               <li><a href="#">Contact</a></li>
            </ul>
         </nav>
      </header>
      <main>
         <section class="about">
            <h1>About Us</h1>
            <p>Insert text about the restaurant here.</p>
         </section>
         <section class="menu">
            <h1>Menu</h1>
            <div class="item">
               <h2>Item 1 Name</h2>
               <p>Item description.</p>
               <span>Item price</span>
            </div>
            <div class="item">
               <h2>Item 2 Name</h2>
               <p>Item description.</p>
               <span>Item price</span>
            </div>
            <!-- Repeat for each item --> 
         </section>
         <section class="order">
            <h1>Order</h1>
            <form>
               <!-- Live order form goes here -->
            </form>
         </section>
      </main>
      <footer>
         <p>Insert contact information here.</p>
      </footer>
      <script src="script.js"></script>
   </body>
</html>

CSS:

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/* Basic styling */
body {
   margin: 0;
   font-family: sans-serif;
}
header {
   background-color: #333;
   color: #fff;
   padding: 10px 20px;
   position: fixed;
   width: 100%;
   top: 0;
}
nav ul {
   list-style: none;
   margin: 0;
   padding: 0;
   display: flex;
   justify-content: space-between;
}
nav li {
   margin: 0 10px;
}
nav a {
   color: #fff;
   text-decoration: none;
}
main {
   padding-top: 60px;
}
section {
   margin: 50px 20px;
}
h1 {
   font-size: 36px;
}
/* Menu styling */
.item {
   background-color: #eee;
   padding: 20px;
   margin-bottom: 20px;
}
.item h2 {
   margin-top: 0;
}
.item span {
   font-weight: bold;
   margin-left: 10px;
}
/* Order form styling */
form {
   display: flex;
   flex-wrap: wrap;
}
form label {
   margin-right: 10px;
}
form input[type="text"],
form select {
   margin-bottom: 10px;
   padding: 10px;
   border-radius: 5px;
}
form button[type="submit"] {
   padding: 10px 20px;
   background-color: #333;
   color: #fff;
   border: none;
   border-radius: 5px;
   margin-top: 10px;
}
/* Footer styling */
footer {
   background-color: #333;
   color: #fff;
   padding: 10px 20px;
   position: fixed;
   bottom: 0;
   width: 100%;
}

JavaScript:

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// Live payment functionality goes here

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import React, { useState } from 'react'
import styled from 'styled-components'

const DropdownContainer = styled.div`
  display: inline-block;
  position: relative;
`

const DropdownMenu = styled.div`
  background-color: #f9f9f9;
  display: none;
  padding: 12px 16px;
  position: absolute;
  right: 0;
  z-index: 1;
`

const DropdownButton = styled.button`
  background-color: transparent;
  border: none;
  color: inherit;

  &:hover + & {
    display: inline-block;
  }
`

function App() {
  const [menuVisible, setMenuVisible] = useState(false)

  const toggleMenu = () => {
    setMenuVisible(!menuVisible)
  }

  return (
    <DropdownContainer>
     <DropdownButton onClick={toggleMenu}>Dropdown</DropdownButton> 
      {menuVisible && (
        <DropdownMenu>
          <ul>
            <li>Option 1</li>
            <li>Option 2</li>
            <li>Option 3</li>
            <li>Option 4</li>
          </ul>
        </DropdownMenu>
      )}
    </DropdownContainer>
  )
}

You can use the addEventListener() method in JavaScript to trigger an event when the navlink is clicked. This event could execute code that would close the navbar hamburger menu.

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navlink.addEventListener('click', () => {
  document.getElementById('hamburger-menu').classList.add('closed');
});

Creating a dropdown menu is a great way to provide users with options. The most common way to do this is by using an HTML <select> tag. Inside the <select> tag, you can include <option> tags to create individual dropdown elements. A basic example of this could be:

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<select>
  <option value="">Choose an Option</option>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

The value attribute of each <option> element sets the value of the dropdown option. Here is an in-depth tutorial on creating dropdown menus.