<?= $form->field($model, 'verifyCode',['labelOptions' => ['class' => 'yanzhengma','style'=>['margin-right'=>'50px']]])->widget(Captcha::className()) ?>

生成的代码

<div class="form-group field-signupform-verifycode">
	<label class="yanzhengma" style="margin-right: 50px;" for="signupform-verifycode">验证码</label>
	<img id="signupform-verifycode-image" src="" alt=""> <input type="text" id="signupform-verifycode" class="form-control" name="SignupForm[verifyCode]">
	<p class="help-block help-block-error"></p>
	</div>

以下为主要的样式修改的代码，大家可以看着修改。如需要修改类而不是样式，只需要替换style为class即可。

 

<?php $form = ActiveForm::begin(['action' => ['site/login'], 'method' => 'post']);?>
    <div style='width:255px;min-height:40px;height:auto;'>
        <label for='loginform-username' style='margin-right:10px;line-height:2.2em;float:left;'>用户名</label>
        <?= $form->field($model, 'username')
            ->label(false)
            ->textInput(['style' => 'float:left;width:200px;'])
            ->error(['style' => 'line-height:2.2em;']); ?>
    </div>
    <div style='width:255px;min-height:40px;height:auto'>
    <label for='loginform-username' style='padding-left:13px;margin-right:10px;line-height:2.2em;float:left;'>密码</label>
    <?= $form->field($model, 'password')
        ->passwordInput()
        ->label(false)
        ->textInput(['style' => 'float:left;width:200px;'])
        ->error(['style' => 'line-height:2.2em;']); ?>
    </div>
    <div style='width:255px;min-height:20px;height:auto'>
        <?= $form->field($model, 'rememberMe')
        ->checkBox(['style' => 'flot:left;'])
        ->label('请记住我', ['style' => 'margin-right:-35px;']); ?>
    </div>

    <?= Html::submitButton('登录', ['class' => 'btn btn-primary', 'name' => 'submit-button']); ?>