index.css

body{
  background-color: white;
}

form {
    width: 390px;
    margin: 50px auto;
    background: #fff;
    padding: 35px 25px;
    text-align: center;
    box-shadow: 0px 5px 5px -0px rgba(0, 0, 0, 0.3);
    border-radius: 5px;
  }
  
  input[type="password"] {
    padding: 0 40px;
    border-radius: 5px;
    width: 350px;
    margin: auto;
    border: 1px solid rgb(228, 220, 220);
    outline: none;
    font-size: 60px;
    color: transparent;
    text-shadow: 0 0 0 rgb(71, 71, 71);
    text-align: center;
  }
  
  input:focus {
    outline: none;
  }
  
  .pinButton {
    border: none;
    background: none;
    font-size: 1.5em;
    border-radius: 50%;
    height: 60px;
    font-weight: 550;
    width: 60px;
    color: transparent;
    text-shadow: 0 0 0 rgb(102, 101, 101);
    margin: 7px 20px;
  }
  
  .clear,
  .enter {
    font-size: 1em !important;
  }
  
  .pinButton:hover {
    box-shadow: #506ce8 0 0 1px 1px;
  }
  .pinButton:active {
    background: #506ce8;
    color: #fff;
  }
  
  .clear:hover {
    box-shadow: #ff3c41 0 0 1px 1px;
  }
  
  .clear:active {
    background: #ff3c41;
    color: #fff;
  }
  
  .enter:hover {
    box-shadow: #47cf73 0 0 1px 1px;
  }
  
  .enter:active {
    background: #47cf73;
    color: #fff;
  }

  .pin-login__text--error {
    color: #901818;
    background: #ffb3b3;
    animation-name: loginError;
    animation-duration: 0.1s;
    animation-iteration-count: 2;
  }

  .notes {
    width: 300px;
    height: 100px;
  }
  
  @keyframes loginError {
    25% {
      transform: translateX(-3px);
    }
    75% {
      transform: translateX(3px);
    }
  }
  
  @-moz-keyframes loginError {
    25% {
      transform: translateX(-3px);
    }
    75% {
      transform: translateX(3px);
    }
  }