body {
    font-family: sans-serif;
  }
  
  * {
    box-sizing: border-box;
  }

  h1{
    text-align: center;
  }
  
  .wrap {
    width: 250px;
  }
  
  form {
    width: 200px;
    margin: 0 auto;
  }
  
  .text-box {
    width: 100%;
    padding: 10px 15px;
    font-size: 14px;
    border-radius: 20px;
    border: 1px solid #aaa;
    margin-bottom: 15px;
  }

  .text-box:focus {
    outline: 0;
    box-shadow: 0 0 4px #39f;
  }

  .btn {
    position: relative;
  
    display: block;
    margin: 5px auto 15px;
    padding: 0;
    width:100%;
  
    overflow: hidden;
  
    border-width: 0;
    outline: none;
    border-radius: 2px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, .6);
    
    background-color: #2ecc71;
    color: #ecf0f1;
    
    transition: background-color .3s;
  }
  
  .btn:hover, .btn:focus {
    background-color: #27ae60;
  }
  
  .btn > * {
    position: relative;
  }
  
  .btn span {
    display: block;
    padding: 12px 24px;
  }
  
  .btn:before {
    content: "";
    
    position: absolute;
    top: 50%;
    left: 50%;
    
    display: block;
    width: 0;
    padding-top: 0;
      
    border-radius: 100%;
    
    background-color: rgba(236, 240, 241, .3);
    
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
  }
  
  .btn:active:before {
    width: 120%;
    padding-top: 120%;
    
    transition: width .2s ease-out, padding-top .2s ease-out;
  }