I change my login screen to show a text inside the text field

<input type="text" placeholder= "Email" name="login" t-att-value="login" id="login" class="form-control" required="required" autofocus="autofocus"/>

How i can show a icon to? i try this but dosent work

&lt;input type="text" placeholder= "Email" name="login" t-att-value="login" id="login" class="form-control glyphicons" required="required" autofocus="autofocus"/>
 

Thanks