<form action="https://google.com/search" method="get" target="_blank">
   <input type="search" name="q" placeholder="Search...">
   <input type="submit" value="Search Google...">
</form>

form {
  margin: 4rem auto;
  width: 600px;
  display: flex;
}

input {
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid #bbb;
}

input[type="search"] {
  padding: 12px 16px;
  width: 100%;
}

input[type="submit"] {
  display: inline-block;
  padding: 12px 16px;
  margin-left: 16px;
  background-color: #ddd;
}

input[type="submit"]:hover {
  cursor: pointer;
  background-color: #bbb;
}