JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main">
    <div id="sign_in">
       <div class="content">
          <form id="register" action="">
               <fieldset>
                   <div class="text">If you would like to register</div>
                    <input class="btn" type="submit" id="register_btn" name="register_btn" value="Register">
                </fieldset>
           </form>
        </div>
     </div>
</div>

CSS

.main {
background: white;
-webkit-border-radius: 5px;
    border-radius: 5px;
    padding-bottom:1px;
-webkit-box-shadow: 0 0 7px 0 black;
    box-shadow: 0 0 7px 0 black;
margin-top: 10px; }

.content {
 margin: 0 10px;   
}

#register {
 border-top: 1px solid #DCDEE0;
padding: 25px 0 0;   
}

#register .text {
margin-bottom: 12px;
font-size: 1.1em;
}

.btn {
height:25px;
width:70px; 
float: left;    
}