我正在尝试创建一个自定义小部件，其中包括带有文本输入表单和按钮的背景图像。我使用的 wordpress 主题是基于 Twitter Bootstrap 的响应式设计。调整浏览器大小时，表单和按钮不会随背景图像一起调整大小。谁能帮我让它正常工作？您可以在实时站点页面右侧的侧栏最底部查看小部件。
谢谢。
<form style="-webkit-background-size: cover;-moz-background-size: cover;
-o-background-size: cover;background-size: cover;padding: 3px;text-align: center;background: url(http://noahsdad.com/wp-content/uploads/2012/05/noahs-dad-side-bar.jpg) no-repeat center;
padding: 30% 0;" action="http://feedburner.google.com/fb/a/mailverify" method="post" target="popupwindow" onsubmit="window.open('http://feedburner.google.com/fb/a/mailverify?uri=noahsdad', 'popupwindow', 'scrollbars=yes,width=550,height=520');return true">
<p>
<input type="text" style="width:170px;height:18px;margin-bottom:-110px;margin-left:-125px;" name="email" onblur="if (this.value == '') {this.value = 'Enter your email address';}" onfocus="if (this.value == 'Enter your email address') {this.value = '';}" value="Enter your email address"/>
</p>
<input type="hidden" value="noahsdad" name="uri"/><input type="hidden" name="loc" value="en_US"/>
<input type="submit" style="margin-bottom:-134px;margin-left:-220px;" value="Subscribe" />
这是我的styles.css（这是一个子主题）
/* ------------------------------------------------------------------------ Import Standard Styles */
@import url( '../standard3/style.css' );
/* ------------------------------------------------------------------------ Customizations */
#disqus_thread {
clear: both!important;
background: white;
background: white;
margin: 0 0 40px 0;
position: relative;
border-radius: 4px;
-moz-border-radius: 4px;
-webkit-border-radius: 4px;
-webkit-box-shadow: inset 0 1px 2px 0 rgba(0, 0, 0, 0.2),transparent 0 0 0,transparent 0 0 0,transparent 0 0 0,transparent 0 0 0;
-moz-box-shadow: inset 0 1px 2px 0 rgba(0, 0, 0, 0.2),transparent 0 0 0,transparent 0 0 0,transparent 0 0 0,transparent 0 0 0;
box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.2),transparent 0 0 0,transparent 0 0 0,transparent 0 0 0,transparent 0 0 0;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
padding: 0 20px;
}
.dsq-comment-text p
{
color: black;
font-size: 13px;
font-weight: normal;
line-height: 18px;
}
.widget .signupForm {
/* Box always has colour, pic always on right */
background-color: #06d0d2;
background-image: url(http://noahsdad.com/wp-content/uploads/2012/05/noahs-dad-side-bar.jpg);
background-position: right bottom;
background-repeat: no-repeat;
/* height ensures full pic is shown */
height: 243px;
/* allow us to position contents */
position: relative;
}
/* Absolutely position the form within the widget */
.widget .signupForm form {
position: absolute;
right: 160px;
bottom: 70px;
}
.widget .signupForm form input {
display: block;
}
//* now just resize the widget box and move the form */
.widget .signupForm {
width: 300px;
height: 240px;
background-size: 100%;
}
.widget .signupForm form {
right: 120px;
bottom: 50px;
}
}
/* adjust slightly for larger sizes */
@media screen and (min-width: 980px) {
.widget .signupForm {
width: 343px;
height: 275px;
background-size: 100%;
}
.widget form .signupForm {
right: 160px;
bottom: 70px;
}
}
/* ------------------------------------------------------------------------ Media Queries */
/* Smartphones */
@media (max-width: 480px) {
}
/* Tablet and Mobile */
@media (max-width: 979px) {
}
/* Mobile to Tablet */
@media only screen and (max-width: 767px) {
}
/* Landscape Tablets */
@media (min-width: 768px) and (max-width: 979px) {
}
/* Desktop */
@media (min-width: 980px) {
}