hii,

i am sharing a simple responsive menu code i.e html and css which you can use whenever you want to create a responsive menu.

HTML:

<div id='Responsivemenu'>
<ul>
   <li class='first'><a href='#'><span>Home</span></a></li>
   <li><a href='#'><span>Products</span></a></li>
   <li><a href='#'><span>Company</span></a></li>
   <li class='last'><a href='#'><span>Contact</span></a></li>
</ul>
</div>

CSS:

#Responsivemenu {
  background: #0693CA;
  width: auto;
}
#Responsivemenu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  line-height: 1;
  display: block;
  zoom: 1;
}
#Responsivemenu ul:after {
  content: " ";
  display: block;
  font-size: 0;
  height: 0;
  clear: both;
  visibility: hidden;
}
#Responsivemenu ul li {
  display: inline-block;
  padding: 0;
  margin: 0;
}
#Responsivemenu.align-right ul li {
  float: right;
}
#Responsivemenu.align-center ul {
  text-align: center;
}
#Responsivemenu ul li a {
  color: #ffffff;
  text-decoration: none;
  display: block;
  padding: 15px 25px;
  font-family: 'Open Sans', sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 14px;
  position: relative;
  transition: color .25s;
}
#Responsivemenu ul li a:hover {
  color: #333333;
}
#Responsivemenu ul li a:hover:before {
  width: 100%;
}
#Responsivemenu ul li a:after {
  content: "";
  display: block;
  position: absolute;
  right: -3px;
  top: 19px;
  height: 6px;
  width: 6px;
  background: #ffffff;
  opacity: .5;
}
#Responsivemenu ul li a:before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: #333333;
  transition: width .25s;
}
#Responsivemenu ul li.last > a:after,
#Responsivemenu ul li:last-child > a:after {
  display: none;
}
#Responsivemenu ul li.first a {
  color: #333333;
}
#Responsivemenu ul li.first a:before {
  width: 100%;
}
#Responsivemenu.align-right li.last > a:after,
#Responsivemenu.align-right li:last-child > a:after {
  display: block;
}
#Responsivemenu.align-right li:first-child a:after {
  display: none;
}
@media screen and (max-width: 768px) {
  #Responsivemenu ul li {
    float: none;
    display: block;
  }
  #Responsivemenu ul li a {
    width: 100%;
    box-sizing: border-box;
    border-bottom: 1px solid #000000;
  }
  #Responsivemenu ul li.last > a,
  #Responsivemenu ul li:last-child > a {
    border: 0;
  }
  #Responsivemenu ul li a:after {
    display: none;
  }
  #Responsivemenu ul li a:before {
    display: none;
  }
}