html {
    background-color: #2196f3;
    min-height: 1000px;
    font-family: "helvetica neue";
    background: url(fondo.png), #009688;
    background: url(fondo.png),
      -webkit-gradient(linear, right top, left top, from(#009688), to(#14756c));
    background: url(fondo.png),
      linear-gradient(to left, #14756c, #009688);
  }
  
  h1 {
    color: #fff;
    padding: 10px;
  }
  
  .wrapper {
    max-width: 400px;
    margin: 50px auto;
    background: white;
    border-radius: 5px;
    box-shadow: 5px 5px 15px -5px rgba(0, 0, 0, 0.3);
  }
  
  #cabecera {
    background-color: #8a3fb5;
    text-align: center;
  }
  
  .elemento {
    min-height: 70px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #f1f1f1;
  }
  
  .elemento:last-child {
    border-bottom: 0;
  }
  
  input[type="checkbox"] {
    margin: 20px;
  }
  
  p {
    margin: 0;
    padding: 20px;
    font-size: 20px;
    font-weight: 200;
    color: #00204a;
  }
  
  form {
    text-align: center;
    margin-left: 20px;
  }
  
  button {
    min-height: 50px;
    width: 50px;
    border-radius: 50%;
    border-color: transparent;
    background-color: #3f51b5;
    color: #fff;
    font-size: 30px;
    padding-bottom: 6px;
    border-width: 0;
    cursor: pointer;
  }
  
  input[type="text"] {
    text-align: center;
    height: 60px;
    top: 10px;
    border: none;
    background: transparent;
    font-weight: 200;
    width: 40%;
  }
  
  input[type="text"]:focus {
    outline: none;
    box-shadow: inset 0 -3px 0 0 #3f51b5;
  }
  
  ::placeholder {
    color: grey;
    opacity: 1;
  }

  .boton__container{
    text-align: center;
  }