Cuadro de entrada de texto transparente HTML

Solución:

Tratar:

  margin: 30px;
  background-color: #ffffff;
  border: 1px solid black;
  opacity: 0.6;
  filter: alpha(opacity=60); /* For IE8 and earlier */

Aquí hay un violín que da un ejemplo.

prueba con

            background-color: transparent;

     input {
        background-color: transparent;

    }
    .WRAPPER {
        background-color: #000;
        height: 575px;
        width: 975px;
        background-image: url("http://wallpapercave.com/wp/2u5OrmL.png");
        top: auto;
        margin: -8px;
    }
    body {
        
        background-color: #000;
        background-image: url("http://wallpapercave.com/wp/2u5OrmL.png");
    }
    #email {
        background-color:rgba(0, 0, 0, 0);
        color:white;
        border: none;
        outline:none;
        height:30px;
        transition:height 1s;
        -webkit-transition:height 1s;
    }
    #email:focus {
      
        height:50px;
        font-size:16px;
    }

<div id="bgDiv" name="bgDiv" class="bgDiv">
<img src="http://wallpapercave.com/wp/2u5OrmL.png" style="background-image: url('http://wallpapercave.com/wp/2u5OrmL.png'); -webkit-background-size: cover; -moz-background-size: cover; -o-background-size: cover; background-size: cover;">
</div>
<div id="mainDiv" name="mainDiv" class="mainDiv">
<form id="iform" name="iform" action="index.php" method="post">
<input type="text" maxleth="18" align="center" id="input" name="input" class="input" placeholder="placeholder" style="border:0;outline:none;width:100%;height:100%;font-size:98px;text-align: center;" autocomplete="off" autofocus>
</form>
</div>

---

---

Utiliza Nuestro Buscador