Bootstrap 4字体很棒的输入图标

Question

我正在试图弄清楚如何在输入字段中添加字体真棒图标。我发现了一个我非常喜欢的设计，我需要在输入字段中放置图标。这就是它的样子：

但是我的表格看起来像这样，而且我无法弄清楚如何添加它们。我寻找了很多答案，但没有一个对我来说一如既往，我希望我能在这里找到答案。

无论如何，这是表格的代码。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" integrity="sha384-y3tfxAZXuh4HwSYylfB+J125MxIs6mR5FOHamPBG064zB+AFeWH94NdvaCBm8qnd" crossorigin="anonymous">
<script src="https://use.fontawesome.com/f4737361cc.js"></script>

<form class="" method="POST" action="">
  <div class="row">
    <div class="col-md-12">
      <div class="form-group">
        <i class="fa fa-user-o"></i>
        <input id="email" type="email" class="form-control custom-input" name="email" value="" placeholder="Email adress" required autofocus style="border-radius: 30px;">
      </div>
    </div>
  </div>

  <div class="row">
    <div class="col-md-12">
      <div class="form-group{{ $errors->has('password') ? ' has-error' : '' }}">
    
         <i class="fa fa-lock"></i>                        
        <input id="password" type="password" class="form-control custom-input" name="password" placeholder="Wachtwoord" required style="border-radius: 30px;">
     
      </div>
    </div>
  </div>

 
</form>

提前致谢

Answer 1

您可以将position:absulote设置为.fa，然后将position:relative添加到.form-control

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form i.fa {
    position: absolute;
    top: 6px;
    left: 20px;
    color: blue;
    font-size: 22px;
    z-index: 9999;
}

.form-control {
    position: relative;
   padding-left: 45px !important;

}

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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" integrity="sha384-y3tfxAZXuh4HwSYylfB+J125MxIs6mR5FOHamPBG064zB+AFeWH94NdvaCBm8qnd" crossorigin="anonymous">
<script src="https://use.fontawesome.com/f4737361cc.js"></script>

<form class="" method="POST" action="">
  <div class="row">
    <div class="col-md-12">
      <div class="form-group">
        <i class="fa fa-user-o"></i>
        <input id="email" type="email" class="form-control custom-input" name="email" value="" placeholder="Email adress" required autofocus style="border-radius: 30px;">
      </div>
    </div>
  </div>

  <div class="row">
    <div class="col-md-12">
      <div class="form-group {{ $errors->has('password') ? ' has-error' : '' }}">
    
         <i class="fa fa-lock"></i>                        
        <input id="password" type="password" class="form-control custom-input" name="password" placeholder="Wachtwoord" required style="border-radius: 30px;">
     
      </div>
    </div>
  </div>

 
</form>

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