Основные классы: .input .label .textarea .select .is-desc .fieldset .legend
Дочерние свойства: размеры is-col, is-*, is-border
<form method="post" action="" autocomplete="off">
<div class="form-item">
<label class="label">Имя</label>
<input class="input" type="text" name="name" class="is-50">
</div>
<div class="form-item">
<label class="label">Страна</label>
<select class="select">
<option value="">---</option>
</select>
</div>
<div class="form-item">
<label class="is-checkbox"><input type="checkbox"> Выбрать</label>
<label class="is-checkbox"><input type="radio"> Выбрать</label>
</div>
<div class="form-item">
<textarea class="textarea" rows="6"></textarea>
</div>
<div class="form-item is-buttons">
<button class="button">Отправить</button>
<button class="button gray">Отменить</button>
</div>
</form>
<div id="previewBlock" style="display: none;"><img src="/img/image.jpg" id="previewHolder" class="image" alt="Обложка" /><br/><br/></div>
<input type="file" name="userfile" id="userfile" style="display: none;" onchange="if(this.files[0].size > (1024 * 1024 * 3)) { alert('Размер файла не должен превышать 3 мб'); } else { document.getElementById('previewHolder').src = window.URL.createObjectURL(this.files[0]); document.getElementById('previewBlock').style.display = 'block'; }">
<label for="userfile" class="button">Выбрать файл</label>
<form>
<div class="form-item">
<label class="label">Город</label>
<input class="input" type="text">
<div class="is-desc">...</div>
</div>
</form>
<form>
<div class="is-row">
<div class="form-item is-col">
<label class="label">City <span class="is-req">*</span></label>
<input class="input" type="text" required>
</div>
<div class="form-item is-col">
<label class="label">City <span class="is-desc">...</span></label>
<input class="input" type="text">
<div class="is-desc">...</div>
</div>
</div>
</form>
<form method="post" action="">
<div class="form-item is-border">
<label class="label">Имя</label>
<input class="input" type="text" name="name" class="is-50">
</div>
<div class="form-item is-border">
<label class="label">Телефон</label>
<input class="input" type="phone" name="phone" class="is-50">
</div>
</form>
<form method="post" action="">
<fieldset class="fieldset">
<legend class="legend">Форма входа</legend>
<div class="form-item">
<label class="label">Имя</label>
<input class="input" type="text" name="name" class="is-50">
</div>
<div class="form-item">
<label class="label">Телефон</label>
<input class="input" type="phone" name="phone" class="is-50">
</div>
</fieldset>
</form>
<form method="post" action="">
<fieldset class="fieldset">
<legend class="legend">О себе</legend>
<div class="form-item">
<textarea class="textarea" name="user-about" rows="5"></textarea>
</div>
<div class="form-item">
<button class="button">Отправить</button>
</div>
</fieldset>
</form>
<form method="post" action="">
<div class="form-item">
<input class="input is-25" type="text" value="25%">
</div>
<div class="form-item">
<input class="input is-50" type="text" value="50%">
</div>
<div class="form-item">
<input class="input is-75" type="text" value="75%">
</div>
<div class="form-item">
<input class="input" type="text" value="100% по стандарту">
</div>
</form>
<form method="post" action="">
<div class="form-item">
<label class="label">E-Mail <span class="is-req">*</span></label>
<input class="input" type="email" name="user-email" required>
</div>
</form>
<form method="post" action="">
<div class="form-item">
<label class="label">Номер телефона</label>
<div class="is-prepend is-50">
<select class="select" name="country">
<option value="7">+7</option>
<option value="380">+380</option>
<option value="375">+375</option>
</select>
<input class="input" type="text">
</div>
</div>
</form>
<form method="post" action="">
<div class="form-item">
<label class="label">Стоимость</label>
<div class="is-prepend is-50">
<span>рублей</span>
<input class="input" type="text">
</div>
</div>
</form>
<form method="post" action="">
<div class="form-item">
<label class="label">Стоимость</label>
<div class="is-append is-50">
<input class="input" type="text">
<span>рублей</span>
</div>
</div>
</form>
<form method="post" action="">
<div class="form-item">
<label class="label">Поле</label>
<div class="is-append is-50">
<input class="input" type="text" name="search" placeholder="Search">
<button class="button">Отправить</button>
</div>
</div>
</form>
<form method="post" action="">
<div class="form-item">
<div class="is-appendprepend is-100">
<span>Поле</span>
<input class="input" type="text" name="search" placeholder="Search">
<button class="button">Отправить</button>
</div>
</div>
</form>
<form method="post" action="">
<label class="label">Много полей</label>
<div class="is-row">
<div class="form-item is-col">
<select class="select"><option>---</option></select>
<div class="is-desc">Год</div>
</div>
<div class="form-item is-col">
<select class="select"><option>---</option></select>
<div class="is-desc">Месяц</div>
</div>
<div class="form-item is-col">
<select class="select"><option>---</option></select>
<div class="is-desc">Число</div>
</div>
</div>
</form>