How to create a ccs drop down menu?

I'm quite new and was wondering how I can create a drop-down menu. I'm aware the question has been asked many times. However, I can't find the solution without having to rewrite my header. I appreciate the help and apologize in advance if the solution is simple and I haven't figured it out yet.

.header {
  width: 100%;
  height: 80px;
  display: block;
  text-align: left;
  color: #2d3a49;
  background: #f5f5f5;
}

.inner_header {
  width: 70%;
  height: 100%;
  display: block;
  margin: 0 auto;
}

.logo_container {
  height: 100%;
  display: table;
  float: left;
}

.logo_container h1 {
  color: #2d3a49;
  height: 100%;
  display: table-cell;
  vertical-align: middle;
  font-family: 'Open Sans';
  font-size: 40px;
  font-weight: 200;
}

.logo_container h1 span {
  font-weight: 800;
}

.navigation {
  float: right;
  height: 100%;
}

.navigation li {
  height: 100%;
  display: table;
  float: left;
  padding: 0px 20px;
}

.navigation li a {
  display: table-cell;
  vertical-align: middle;
  height: 100%;
  font-family: 'Open Sans';
  font-size: 20px;
}
<div class="header">
  <div class="inner_header">
    <div class="logo_container">
      <h1>Wise <span>Software</span></h1>
    </div>

    <ul class="navigation">
      <li><a href="#">Home</a></li>
      <li><a href="#">Blog</a></li>
      <ul>
        <li><a href="#">Food</a></li>
        <li><a href="#">Recipes</a></li>
      </ul>
      <li><a href="#">Contact</a></li>
      <li><a href="#">Price</a></li>
    </ul>
  </div>
</div>

Maybe something like the accompanying snippet could be of use. You would need to create a div to house the dropdown content, in addition to a button that would trigger the dropdown menu to appear when hovered upon. Feel free to style accordingly.

.header {
    width: 100%;
    height: 80px;
    display: block;
    text-align: left;
    color: #2d3a49;
    background: #f5f5f5;
    }

.inner_header{
   width: 70%;
   height: 100%;
   display: block;
   margin: 0 auto;
   }

.logo_container{
   height: 100%;
   display: table;
   float: left;
   }

.logo_container h1{
   color: #2d3a49;
   height: 100%;
   display: table-cell;
   vertical-align: middle;
   font-family: 'Open Sans';
   font-size: 40px;
   font-weight: 200;
   }

.logo_container h1 span{
   font-weight: 800;
   }

.navigation{
   float: right;
   height: 100%;
   }

   
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {
  background-color: #ddd;
}

.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown {
  float: right;
  overflow: hidden;
  margin-right:50px;
  background-color: black;
  margin-top: 20px;
  border-radius: 25px;
}

.dropdown .dropbtn {
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}
<div class="header">
<div class="inner_header">
  <div class="logo_container">
    <h1>Wise <span>Software</span></h1>
  </div>

  <div class="dropdown">
    <button class="dropbtn">Dropdown 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
      <a href="#">Home</a>
      <a href="#">Blog</a>
      <a href="#">Food</a>
      <a href="#">Recipes</a>
      <a href="#">Contact</a>
      <a href="#">Price</a>
    </div>
  </div>
</div>