How to make a form with icons?

You can add the icons before fields of a form. Using icons, form looks attractive. So use icons before the field.

HTML

<form action="">
  <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>
  <button type="submit" class="btn btn-success">Submit</button>
</form>

CSS

/* 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;
}