how to add a search engine in html

  /* Add a black background color to the top navigation bar */
.topnav {
  overflow: hidden;
  background-color: #e9e9e9;
}

/* Style the links inside the navigation 
  bar */
.topnav 
  a {
  float: left;
  display: block;
  color: black;
  text-align: center;
  
  padding: 14px 16px;
  text-decoration: none;
  
  font-size: 17px;
}

/* Change the color of links on hover */
.topnav a:hover {

    background-color: #ddd;
  
  color: black;
}

  
/* Style the "active" element to highlight the current page */
.topnav a.active {

    background-color: #2196F3;
  color: white;
}

  
/* Style the search box inside the navigation bar */
.topnav input[type=text] {
  float: right;
  padding: 6px;
  border: none;
  margin-top: 8px;
  margin-right: 16px;

    font-size: 17px;
}

/* 
  When the screen is less than 600px wide, stack the links and the search field 
  vertically instead of horizontally */
@media screen and (max-width: 600px) {
  
  .topnav a, .topnav input[type=text] {
    
  float: none;
    display: block;
    
  text-align: left;
    width: 100%;
    
  margin: 0;
    padding: 14px;
  }
  .topnav input[type=text] {
    border: 1px 
  solid #ccc;
  }
}