how to make a html login

HTML
<html>
      <head>
    <title>Login page example</title>
    <style>
      input{
        font-size: 20;
      }
      body{
        background-color: red;
      }
    </style>
  </head>
  <body>
    <input placeholder="Username"/>
    <br />
    <input type="password" placeholder="Password"/>
    <br/>
    <br/>
    <button>Login</button>
    </body>

</html>
Source