Создадим форму залогинивания используя CSS3 и jQuery.

Разметка HTML

    <form action="#">
        <input type="text" name="username" placeholder="логин">   
        <input type="password" name="password" placeholder="пароль">       
        <span>
            <input type="checkbox" name="checkbox">
            <label for="checkbox">запомнить</label>
        </span>   
        <input type="submit" value="Войти">
    </form>

CSS

.login-form,
.login-form h1,
.login-form span,
.login-form input,
.login-form label {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
}

/* Form Container */
.login-form {
    position: relative;
    width: 200px;
    height: 200px;
    padding: 15px 25px 0 25px;
    margin-top: 15px;
    cursor: default;

    background-color: #141517;

    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;

    -webkit-box-shadow: 0px 1px 1px 0px rgba(255,255,255, .2), inset 0px 1px 1px 0px rgb(0,0,0);
    -moz-box-shadow: 0px 1px 1px 0px rgba(255,255,255, .2), inset 0px 1px 1px 0px rgb(0,0,0);
    box-shadow: 0px 1px 1px 0px rgba(255,255,255, .2), inset 0px 1px 1px 0px rgb(0,0,0);
}

.login-form:before {
    position: absolute;
    top: -12px;
    left: 10px;

    width: 0px;
    height: 0px;
    content: '';
   
    border-bottom: 10px solid #141517;
    border-right: 10px solid #141517;
    border-top: 10px solid transparent;
    border-left: 10px solid transparent;
}

/* Form Title */
.login-form    h1 {
    line-height: 40px;
    font-family: 'Myriad Pro', sans-serif;
    font-size: 22px;
    font-weight: normal;
    color: #e4e4e4;
}

/* Form Input General Styles */
.login-form input[type=text],
.login-form input[type=password],
.login-form input[type=submit] {
    line-height: 14px;
    margin: 10px 0;
    padding: 6px 15px;
    border: 0;
    outline: none;

    font-family: Helvetica, sans-serif;
    font-size: 12px;
    font-weight: bold;
    text-shadow: 0px 1px 1px rgba(255,255,255, .2);

    -webkit-border-radius: 26px;
    -moz-border-radius: 26px;
    border-radius: 26px;

    -webkit-transition: all .15s ease-in-out;
    -moz-transition: all .15s ease-in-out;
    -o-transition: all .15s ease-in-out;
    transition: all .15s ease-in-out;
}

/* Form User&Pass Input Styles */
.login-form input[type=text],
.login-form input[type=password],
.js .login-form span {
    color: #686868;
    width: 170px;

    -webkit-box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .6);
    -moz-box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .6);
    box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .6);

    background: #989898;
    background: -moz-linear-gradient(top,  #ffffff 0%, #989898 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#989898));
    background: -webkit-linear-gradient(top,  #ffffff 0%,#989898 100%);
    background: -o-linear-gradient(top,  #ffffff 0%,#989898 100%);
    background: -ms-linear-gradient(top,  #ffffff 0%,#989898 100%);
    background: linear-gradient(top,  #ffffff 0%,#989898 100%);
}

.login-form input[type=text]:hover,
.login-form input[type=password]:hover {
    -webkit-box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .6), 0px 0px 5px rgba(255,255,255, .5);
    -moz-box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .6), 0px 0px 5px rgba(255,255,255, .5);
    box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .6), 0px 0px 5px rgba(255,255,255, .5);
}

.login-form input[type=text]:focus,
.login-form input[type=password]:focus {
    background: #e1e1e1;
    background: -moz-linear-gradient(top,  #ffffff 0%, #e1e1e1 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#e1e1e1));
    background: -webkit-linear-gradient(top,  #ffffff 0%,#e1e1e1 100%);
    background: -o-linear-gradient(top,  #ffffff 0%,#e1e1e1 100%);
    background: -ms-linear-gradient(top,  #ffffff 0%,#e1e1e1 100%);
    background: linear-gradient(top,  #ffffff 0%,#e1e1e1 100%);
}

/* Form Submit Input Styles */
.login-form input[type=submit],
.js .login-form span.checked:before {
    float: right;
    cursor: pointer;

    color: #445b0f;

    -webkit-box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .45), 0px 1px 1px 0px rgba(0,0,0, .3);
    -moz-box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .45), 0px 1px 1px 0px rgba(0,0,0, .3);
    box-shadow: inset 1px 1px 1px 0px rgba(255,255,255, .45), 0px 1px 1px 0px rgba(0,0,0, .3);
}

.login-form input[type=submit]:hover {
    -webkit-box-shadow: inset 1px 1px 3px 0px rgba(255,255,255, .8), 0px 1px 1px 0px rgba(0,0,0, .6);
    -moz-box-shadow: inset 1px 1px 3px 0px rgba(255,255,255, .8), 0px 1px 1px 0px rgba(0,0,0, .6);
    box-shadow: inset 1px 1px 3px 0px rgba(255,255,255, .8), 0px 1px 1px 0px rgba(0,0,0, .6);
}

.login-form input[type=submit]:active {
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;
}

/* Form Green Gradient Styles */
.login-form input[type=submit],
.js .login-form span.checked:before {
    background: #a5cd4e;
    background: -moz-linear-gradient(top,  #a5cd4e 0%, #6b8f1a 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#a5cd4e), color-stop(100%,#6b8f1a));
    background: -webkit-linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
    background: -o-linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
    background: -ms-linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
    background: linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
}

/* Form Checkbox Input Styles */
.js .login-form input[type=checkbox] {
    position: fixed;
    left: -9999px;
}

.login-form span {
    position: relative;
    margin-top: 15px;
    float: left;
}

.js .login-form span {
    width: 16px;
    height: 16px;
    cursor: pointer;

    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    border-radius: 2px;
}

.js .login-form span.checked:before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    width: 8px;
    height: 8px;

    -webkit-box-shadow: 0px 1px 1px 0px rgba(255,255,255, .45), inset 0px 1px 1px 0px rgba(0,0,0, .3);
    -moz-box-shadow: 0px 1px 1px 0px rgba(255,255,255, .45), inset 0px 1px 1px 0px rgba(0,0,0, .3);
    box-shadow: 0px 1px 1px 0px rgba(255,255,255, .45), inset 0px 1px 1px 0px rgba(0,0,0, .3);
}

/* Form Label Styles */

.login-form label {
    position: absolute;
    top: 1px;
    left: 25px;
    font-family: sans-serif;
    font-weight: bold;
    font-size: 12px;
    color: #e4e4e4;
}

javascript

Подключаем jQuery библиотеку и скрипт:

$(document).ready(function() {

    // Check if javascript is enabled
    $('body').addClass('js');

    // Make the checkbox checked on load
    $('.login-form span').addClass('checked').children('input').attr('checked', true);

    // Click function
    $('.login-form span').on('click', function() {

        if ($(this).children('input').attr('checked')) {
            $(this).children('input').attr('checked', false);
            $(this).removeClass('checked');
        }

        else {
            $(this).children('input').attr('checked', true);
            $(this).addClass('checked');
        }
   
    });

});
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