[html]<!-- Add icon library -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

<form action="/action_page.php">
  <h2>ФОРМА РЕГИСТРАЦИИ</h2>
  <div class="input-container">
    <i class="fa fa-user icon"></i>
    <input class="input-field" type="text" placeholder="Имя пользователя" name="usrnm">
  </div>

  <div class="input-container">
    <i class="fa fa-envelope icon"></i>
    <input class="input-field" type="text" placeholder="Эл.адрес" name="email">
  </div>

  <div class="input-container">
    <i class="fa fa-key icon"></i>
    <input class="input-field" type="password" placeholder="Пароль" name="psw">
  </div>

  <button type="submit" class="btn">Регистрация</button>
</form>

<style>
* {box-sizing: border-box;}

/* Style the input container */
.input-container {
  display: flex;
  width: 100%;
  margin-bottom: 15px;
}

/* Style the form icons */
.icon {
  padding: 10px;
  background: dodgerblue;
  color: white;
  min-width: 50px;
  text-align: center;
}

/* Style the input fields */
.input-field {
  width: 100%;
  padding: 10px;
  outline: none;
}

.input-field:focus {
  border: 2px solid dodgerblue;
}

/* Set a style for the submit button */
.btn {
  background-color: dodgerblue;
  color: white;
  padding: 15px 20px;
  border: none;
  cursor: pointer;
  width: 100%;
  opacity: 0.9;
}

.btn:hover {
  opacity: 1;
}
</style>
[/html]

Шаг 1) добавить HTML:

Код:
<!-- Add icon library -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

<form action="/action_page.php">
  <h2>Register Form</h2>
  <div class="input-container">
    <i class="fa fa-user icon"></i>
    <input class="input-field" type="text" placeholder="Username" name="usrnm">
  </div>

  <div class="input-container">
    <i class="fa fa-envelope icon"></i>
    <input class="input-field" type="text" placeholder="Email" name="email">
  </div>

  <div class="input-container">
    <i class="fa fa-key icon"></i>
    <input class="input-field" type="password" placeholder="Password" name="psw">
  </div>

  <button type="submit" class="btn">Register</button>
</form>

Шаг 2) добавить CSS:

Код:
* {box-sizing: border-box;}

/* Style the input container */
.input-container {
  display: flex;
  width: 100%;
  margin-bottom: 15px;
}

/* Style the form icons */
.icon {
  padding: 10px;
  background: dodgerblue;
  color: white;
  min-width: 50px;
  text-align: center;
}

/* Style the input fields */
.input-field {
  width: 100%;
  padding: 10px;
  outline: none;
}

.input-field:focus {
  border: 2px solid dodgerblue;
}

/* Set a style for the submit button */
.btn {
  background-color: dodgerblue;
  color: white;
  padding: 15px 20px;
  border: none;
  cursor: pointer;
  width: 100%;
  opacity: 0.9;
}

.btn:hover {
  opacity: 1;
}
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