<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>

.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;   
}

$(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');   
    }   
       
    });   

});