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HTML

CSS

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <!-- The error message is kept static for demo purpose only. -->
<div id="app-cover">
  <div id="password-box">
    <i class="fas fa-lock" id="icon-1"></i>
    <div id="input-box">
      <input type="password" id="password" placeholder="Enter your password">
    </div>
    <i class="fas fa-chevron-right" id="icon-2"></i>
    <div id="init-btn"></div>
  </div>
  <div id="error-box">
    <div id="error-message">
      <div id="error-message-i">
        <i class="fas fa-exclamation-triangle"></i>
      </div>
      <span>Password must contain a number</span>
    </div>
    <div id="box-1" class="c-box"></div>
    <div id="box-2" class="c-box b24"></div>
    <div id="box-3" class="c-box"></div>
    <div id="box-4" class="c-box b24"></div>
  </div>
</div>
<a href="https://dribbble.com/shots/5403244-Password-Error-Animation" target="_blank" id="dribbble"><i class="fab fa-dribbble"></i></a>
              
            
!

CSS

              
                *:focus
{
    outline: none;
}

html, body
{
    height: 100%;
    min-height: 100%;
}

body
{
    margin: 0;
    background-color: #f44336;
}

#app-cover
{
    position: absolute;
    top: 50%;
    right: 0;
    left: 0;
    width: 310px;
    margin: -28px auto 0 auto;
    background-color: #fff;
    border-radius: 3px;
    box-shadow: 0 20px 30px -20px #000;
    overflow: hidden;
}

#password-box
{
    position: relative;
    height: 46px;
    padding: 0 46px;
}

#password-box i
{
    position: absolute;
    top: 0;
    bottom: 0;
    width: 16px;
    text-align: center;
    line-height: 1;
    padding: 15px;
}

#icon-1
{
    left: 0;
}

#password-box #icon-2
{
    right: 0;
    padding: 15px 20px;
    cursor: pointer;
}

#input-box
{
    position: absolute;
    top: 0;
    right: 56px;
    bottom: 0;
    left: 46px;
}

#input-box input
{
    width: 100%;
    height: 46px;
    font-size: 24px;
    font-family: Arial, Helvetica, sans-serif;
    letter-spacing: 3px;
    padding: 0;
    margin: 0;
    border: 0;
}

#input-box input::placeholder
{
    position: relative;
    top: -2px;
    color: #bababa;
    font-size: 14px;
    letter-spacing: 0;
}

#password-box i, #input-box input
{
    color: #3c3c3c;
}

#init-btn
{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 56px;
    height: 46px;
    cursor: pointer;
    z-index: 1;
}

#init-btn.zindex
{
    width: 42px;
    z-index: 3;
}

#error-box
{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
}

#error-box.zindex, #error-box.active
{
    z-index: 2;
}

#error-message
{
    position: absolute;
    top: 0;
    left: -280px;
    right: 0;
    color: #fff;
    font-size: 13px;
    font-family: arial;
    line-height: 14px;
    padding: 16px 42px 16px 60px;
    transition: 0.3s linear all;
    z-index: 2;
}

#error-message-i
{
    position: absolute;
    top: 0;
    left: 0;
    width: 16px;
    color: #f44336;
    font-size: 14px;
    padding: 16px 15px;
    background-color: #fff;
}

#error-message-i.shake i
{
    animation: shake 0.1s linear 0.3s forwards;
}

@keyframes shake
{
    0%{ margin-left: 0; }
    25%{ margin-left: 4px; }
    50%{ margin-left: 0; }
    75%{ margin-left: -4px; }
    100%{ margin-left: 0; }
}

#error-box.active #error-message
{
    left: 0;
}

.c-box
{
    position: absolute;
    transition: 0.3s linear all;
}

#box-1
{
    top: 0;
    bottom: 0;
    left: -23px;
    width: 0;
    background-color: #3c3c3c;
}

#error-box.active #box-1
{
    left: 0;
    width: 264px;
}

#box-1:before
{
    content: '';
    position: absolute;
    right: -46px;
    width: 0;
    height: 0;
    border: 23px solid transparent;
    border-left-color: #3c3c3c;
}

#box-2, #box-4
{
    position: absolute;
    right: -29px;
    width: 0;
    height: 0;
    border: 23px solid transparent;
    border-right-color: #3c3c3c;
}

#error-box.active #box-2
{
    right: -4px;
}

#box-2:before, #box-2:after
{
    width: 22px;
    transition: 0.3s ease all;
}

#box-2:before
{
    top: -16px;
    left: 0px;
    transform: rotate(-45deg) translateX(24px);
}

#box-2.active:before
{
    transform: rotate(-45deg) translateX(2px);
}

#box-2:after
{
    bottom: -16px;
    left: 0px;
    transform: rotate(45deg) translateX(24px);
}

#box-2.active:after
{
    transform: rotate(45deg) translateX(2px);
}

#box-2:before, #box-2:after, #box-4:before, #box-4:after
{
    content: '';
    position: absolute;
    height: 5px;
    background-color: #3c3c3c;
}

#box-4
{
    right: 23px;
    border-right-color: transparent;
}

#box-4:before, #box-4:after
{
    width: 24px;
    left: -1px;
    transition: 0.3s ease all;
}

#box-4:before
{
    top: -17px;
    transform: rotate(45deg) translateX(-28px); 
}

#box-4.active:before
{
    transform: rotate(45deg) translateX(-2px);
}

#box-4:after
{
    bottom: -17px;
    transform: rotate(-45deg) translateX(-28px); 
}

#box-4.active:after
{
    transform: rotate(-45deg) translateX(-2px);
}

#box-3
{
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
}

#box-3:before, #box-3:after
{
    content: '';
    position: absolute;
    left: -44px;
    border: 23px solid transparent;
    transition: 0.3s ease all;
}

#box-3:before
{
    top: -23px;
    border-top-color: #3c3c3c;
}

#error-box.active #box-3:before
{
    top: -3px;
}

#box-3:after
{
    bottom: -69px;
    border-bottom-color: #3c3c3c;
}

#error-box.active #box-3:after
{
    bottom: -49px;
}

#dribbble
{
    display: block;
    position: absolute;
    right: 0;
    bottom: 0;
    text-decoration: none;
    padding: 20px;
}

#dribbble i
{
    display: block;
    width: 20px;
    height: 20px;;
    color: #fff;
    font-size: 20px;
    line-height: 1;
}
              
            
!

JS

              
                $(function()
{
    var password = $('#password'), initBtn = $('#init-btn'), errorBox = $('#error-box'), b24 = $('.b24'), alertTriangle = $('#error-message-i');

    function showHideErrorMessage()
    {
        if( password.val().trim().length > 0 )
        {
            $(this).toggleClass('zindex');
            
            if( errorBox.hasClass('active') )
            {
                b24.toggleClass('active');
                alertTriangle.toggleClass('shake');
                
                setTimeout(function()
                {
                    errorBox.toggleClass('active');
                },300); 

                setTimeout(function()
                {
                    errorBox.toggleClass('zindex');
                },600);
            }
            else
            {
                errorBox.toggleClass('active zindex');
                setTimeout(function()
                {
                    alertTriangle.toggleClass('shake');
                    b24.toggleClass('active');
                },300);
            }
        }
    }

    initBtn.on('click',showHideErrorMessage);
});
              
            
!
999px

Console