后备/自适应CSS样式
[英]Fallback / Responsive CSS Styles
问题描述
I've just upgraded my site to include responsive styles, but when I uploaded the changes, the fallback (original / fluid) styles don't work. 
我刚刚升级了网站，使其包括响应式样式，但是当我上传更改时，后备（原始/流畅）样式不起作用。 It just uses the highest min-width responsive styles. 它仅使用最高的最小宽度响应样式。 What did I do wrong? 我做错了什么？
My site is http://jcwebandgraphic.com/ 我的网站是http://jcwebandgraphic.com/
HTML 的HTML
<body>
<!-- #nav-bkg: Nav BKG Image Scrollstop -->
<div id='nav-bkg' class='scroll'>
<img src='images/dandelion-nav-color.png'>
<img src='images/dandelion-nav.png'>
</div> <!-- Closes #nav-bkg -->
<!-- nav: Top Nav -->
<nav role='navigation'>
<ul>
<li><a href='#services-section'>Services</a></li>
<!--
<li><a href='#products-section'>Products</a></li>
-->
<li><a href='#work-section'>Work</a></li>
<li><a href='#contact-section'>Contact</a></li>
</ul>
</nav> <!-- Closes Top Nav -->
<!-- #logo: Logo -->
<div id='logo-container'>
<img id='logo' src='images/logo2.png'>
</div> <!-- Closes #logo -->
<!-- #page-wrapper Page Wrapper -->
<div id='page-wrapper' role='main'>
<!-- .scroll: Site BKG Image Scrollstop -->
<div class='scroll'>
<img src='images/dandelion-color.jpg'>
<img src='images/dandelion-greyscale.jpg'>
</div> <!-- Closes .scroll -->
<!-- #about-section: About Me-->
<section id='about-section'>
<h2 class='subtitle'>About Us</h2>
<p>
Welcome! We're a powerful little design house based in the beautiful Pacific Northwest. We specialize in web development, graphic design, hosting, and so much more. Our sophisticated aesthetic and versatile designs are perfect for all your modern web, printing, and signage needs. Check out our remarkably affordable rates below or request a quote for our best pricing option.
</p>
</section> <!-- Closes #about-section -->
<!-- #services-section: Service Types Offered -->
<section id='services-section' class='main-section-styles'>
<h2 class='subtitle'>Services</h2>
<!-- .fa-icon: Large FA Icon Container -->
<div id='fa-icon'>
<div class='icon'>
<i class='fa fa-laptop icon-fixed-width fa-3x'></i>
<h5>Web</h5>
</div>
<div class='icon'>
<i class='fa fa-magic icon-fixed-width fa-3x'></i>
<h5>Graphic</h5>
</div>
<div class='icon'>
<i class='fa fa-connectdevelop icon-fixed-width fa-3x'></i>
<h5>Hosting</h5>
</div>
<div class='icon'>
<i class='fa fa-wrench icon-fixed-width fa-3x'></i>
<h5>IT</h5>
</div>
</div> <!-- Closes .fa-icon -->
</section> <!-- Closes #services-section -->
<!-- #specials: Specials -->
<section id='specials' class='main-section-styles'>
<h2 class='subtitle'>Specials</h2>
<div class='offer'>
<p>
Static Single-Page Site just $99!
</p>
<p>
2 Years of Hosting + IT just $75!
</p>
<br>
<span>
Offers end November 1st, 2015
</span>
</div>
</section> <!-- Closes #specials -->
<!-- #work-section: Portfolio Examples -->
<section id='work-section' class='main-section-styles'>
<h2 class='subtitle'>Work</h2>
<ul class='slider'>
<img src='images/africanbn.png' alt='Professional Project: The African Bridge Project'>
<img src='images/air.jpg' alt='Professional Project: Audio Information Radio'>
<img src='images/bird.jpg' alt='Student Project: 13 Ways of Looking at a Blackbird'>
<img src='images/dana.jpg' alt='Professional Project: Dana Chapman Massage'>
<img src='images/ethics.jpg' alt='Student Project: Tools for Ethical Dilemmas'>
<img src='images/placestory.jpg' alt='Student Project: This is Me'>
<img src='images/sote.jpg' alt='Professional Project: Spa of the Earth'>
<img src='images/zavaah.jpg' alt='Student Project: Zava'ah, An Ethical Will'>
</ul>
</section>
<!-- #contact-section: Contact Form & Info -->
<section id='contact-section' class='main-section-styles'>
<h2 class='subtitle'>Contact</h2>
<br><br>
Phone: <a href='callto:+13602810359'> 360-281-0359</a>
<address>Email: <a href='mailto:info@jcwebandgraphic.com'> info@jcwebandgraphic.com</a></address>
<br>
<div id='contactform'>
<form action='contact.php' method='post'>
<div class='contact-wrap'>
<p>Your Name :<input class='type' type='text' name='cf_name'></p>
<p>Your E-mail:<input class='type' type='text' name='cf_email'></p>
<p class='antispam'>Spam-Bots!:<input class='type' type='text' name='url' placeholder='** Leave Blank **'></p>
</div>
<div class='contact-wrap'>
<p id='message'>
Message:
<textarea name='cf_message'></textarea>
<input class='button' type='submit' value='Send'>
<input class='button' type='reset' value='Clear'>
</p>
</div>
</form>
</div> <!-- Closes #contactform -->
</section> <!-- Closes #contact-section -->
<footer>
<p id='copyright'>
© JC Web & Graphic 2015
</p>
<!--
<p>
<a href='resume.pdf' target='_blank'>Download Resume</a>
</p>
-->
</footer>
</div> <!-- Closes #page-wrapper -->
</body>
</html>
CSS Fallback CSS后备
@media screen and (min-width: 1000px) {
body {
width: 100%;
background-color: #696773;
}
footer {
width: 100%;
position: relative;
bottom: 0;
left: 0;
}
/* **************************************** Menu Styles **************************************** */
nav {
width: 100%;
position: fixed;
top: 0;
left: 0;
z-index: 600;
}
nav ul {
width: 100%;
}
nav ul li {
width: 30.333%;
padding: 1.5%;
text-align: center;
text-decoration: none;
list-style-type: none;
float: left;
}
nav ul li a {
width: 98%;
padding: 2% 7%;
text-decoration: none;
color: #ffffff;
}
nav ul li a:hover {
color: #ffffff;
outline: 1px solid #ffffff;
}
#nav-bkg {
z-index: 500;
}
/* **************************************** Logo Styles **************************************** */
#logo-container {
width: 20%;
margin: 20% 40% 3% 40%;
}
#logo {
width: 100%;
}
/* ************************************* Scrollstop Styles ************************************* */
.scroll {
width: 100%;
position: fixed;
top: 0;
left: 0;
z-index: -1;
}
.scroll img {
width: 100%;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
.scroll img:first-child {
opacity: 1;
}
.scroll img:nth-child(2) {
opacity: 1;
transition-duration: 1s;
transition-timing-function: ease;
}
/* ************************************ Main Content Styles ************************************ */
section {
width: 90%;
margin: 0;
margin-top: 1%;
padding: 5%;
background-color: #ffffff;
color: #696773;
overflow: auto;
}
.subtitle {
font-family: 'hipstelveticaultralight';
font-size: 1.9em;
font-weight: 200;
color: #50E5C0;
}
/* Services Section Styles */
#services-section {
width: 34%;
height: 350px;
margin: 2% 1% 2% 5%;
background-color: #696773;
float: left;
opacity: .95;
}
#services-section .subtitle {
margin-bottom: 15%;
font-size: 1.5em;
color: #ffffff;
}
#services-section #fa-icon {
width: 100%;
text-align: center;
}
#services-section #fa-icon .icon {
width: 25%;
color: #f26da5;
float: left;
}
#services-section #fa-icon i {
padding-bottom: 15%;
}
#services-section h5 {
margin-top: 10%;
font-size: .75em;
text-align: center;
color: #ffffff;
border-top: 1px solid #ffffff;
}
/* Specials Section Styles */
#specials {
width: 34%;
height: 350px;
margin: 2% 5% 2% 1%;
background-color: #696773;
color: #ffffff;
float: right;
opacity: .95;
}
#specials .subtitle {
margin-bottom: 15%;
font-size: 1.5em;
color: #ffffff;
}
#specials p {
color: #50E5C0;
}
#specials span {
margin-top: 1em;
font-size: .7em;
float: right;
}
/* Work Section Styles */
#work-section {
width: 80%;
margin: 0 5%;
}
#work-section img {
width: 22%;
padding: 1%;
box-shadow: 0 0 8px #696773;
}
/* Contact Section Styles */
#contact-section {
margin-top: 5%;
color: #ffffff;
background-color: #696773;
opacity: .95;
}
#contact-section .subtitle {
color: #ffffff;
}
.contact-wrap {
width: 50%;
float: left;
}
#contact-section address {
font-style: normal;
}
#contact-section p {
text-indent: 2em;
}
#contact-section p .type {
width: 75%;
margin: .5%;
padding: .5%;
font-size: 1em;
color: #ffffff;
background-color: #696773;
border-radius: 5px;
border: 2px solid #00FFD4;
opacity: .75;
}
#contact-section a {
color: #ffffff;
text-decoration: none;
font-style: normal;
}
#contact-section a:hover {
text-decoration: underline;
}
.antispam ::-webkit-input-placeholder {
background-color: #50E5C0;
color: #ffffff;
opacity: 1;
}
:-moz-placeholder { /* Firefox 18- */
background-color: #50E5C0;
color: #ffffff;
opacity: 1;
}
::-moz-placeholder { /* Firefox 19+ */
background-color: #50E5C0;
color: #ffffff;
opacity: 1;
}
:-ms-input-placeholder {
background-color: #50E5C0;
color: #ffffff;
opacity: 1;
}
#contact-section textarea {
width: 78%;
margin: .5%;
padding: .5%;
color: #ffffff;
background-color: #696773;
border-radius: 3px;
border: 2px solid #00FFD4;
opacity: .75;
}
#contact-section #message .button {
width: 20%;
margin: 1.5%;
font-size: .75em;
color: #696773;
background-color: #ffffff;
border: initial;
border-radius: 5px;
border: 1px solid #CCC0B7;
float: right;
}
#contact-section #message .button:hover {
color: #ffffff;
background-color: #696773;
}
/* Footer Section Styles */
footer #copyright {
margin-top: 10%;
padding: .5%;
text-align: center;
color: #686673;
background-color: #ffffff;
}
footer p {
text-align: center;
}
footer a {
padding: 0;
color: #F26DA5;
}
}
CSS Responsive CSS响应式
@media screen and (min-width: 300px) {
/* ********************************* Scrollstop Styles ********************************* */
.scroll img {
visibility: hidden;
}
/* ************************************ Logo Styles ************************************ */
#logo-container {
width: 70%;
margin: 40% 15% 25% 15%;
}
#logo-container img {
opacity: 1!important;
}
/* ************************************ Menu Styles ************************************ */
nav {
height: 30px;
padding-bottom: 1em;
background-color: #696773;
}
nav a {
font-size: .75em;
}
nav ul li a:hover {
outline: initial;
font-size: 1em;
}
#nav-bkg img {
visibility: hidden;
}
/* ******************************** Main Content Styles ******************************** */
.subtitle {
padding: 3%;
font-size: 1.25em;
}
p {
font-size: .85em;
text-align: justify;
}
#services-section {
width: 80%;
margin: 5% 10%;
padding: 0;
}
#services-section #fa-icon .icon {
width: 50%;
margin: 0 0 15% 0;
padding: 0;
font-size: .65em;
color: #f26da5;
float: left;
}
#services-section h5 {
margin: 0;
padding: 0;
font-size: 1em;
border-top: none;
}
#specials {
width: 80%;
margin: 5% 10%;
padding: 0;
float: right;
}
#work-section {
width: 100%;
margin: 0;
padding: 0;
}
#work-section .slider img {
width: 96%;
margin: 2%;
padding: 0;
}
#contact-section {
width: 90%;
margin: 15% 0;
padding: 5%;
}
#contact-section .subtitle {
margin-bottom: 10%;
}
#contact-section p {
width: 100%;
margin: 0;
padding: 0;
text-align: left;
}
#contact-section p .type {
width: 100%;
margin: 0;
padding: 0;
}
#contact-section .contact-wrap {
width: 100%;
margin: 0;
padding: 0;
float: left;
}
#contactform {
margin-top: 15%;
}
#contact-section textarea {
width: 100%;
margin: 0;
padding: 0;
}
#contact-section #message .button {
width: 50%;
margin: 0;
padding: 0;
}
br {
display: none;
}
}
@media screen and (min-width: 500px) {
/* ************************************ Logo Styles ************************************ */
#logo-container {
margin: 45% 15%;
}
/* ******************************** Main Content Styles ******************************** */
.subtitle {
font-size: 1.5em;
}
p {
font-size: 1em;
}
#about-section {
width: 70%;
padding: 10% 15% 20% 15%;
}
#about-section p {
padding-bottom: 20%;
border-bottom: 1px solid #696773;
}
#services-section {
margin: 5% 10% 25% 10%;
padding: 10% 0 20% 0;
border-bottom: 1px solid #ffffff;
}
#specials {
margin: 5% 10% 25% 10%;
}
}
@media screen and (min-width: 600px) {
/* ************************************ Logo Styles ************************************ */
#logo-container {
width: 50%;
margin: 45% 25%;
}
/* ******************************** Main Content Styles ******************************** */
.subtitle {
padding: 3%;
font-size: 1.5em;
}
#services-section #fa-icon .icon {
width: 50%;
margin: 0 0 15% 0;
padding: 0;
font-size: .65em;
color: #f26da5;
float: left;
}
}
@media screen and (min-width: 700px) {
/* ************************************ Logo Styles ************************************ */
#logo-container {
width: 40%;
margin: 40% 30%;
}
/* ************************************ Menu Styles ************************************ */
nav a {
font-size: 1em;
}
nav ul li a:hover {
outline: 1px solid #ffffff;
}
/* ******************************** Main Content Styles ******************************** */
#services-section {
margin: 5% 10% 25% 10%;
padding: 10% 0 20% 0;
border-bottom: 1px solid #ffffff;
}
#services-section {
height: 400px;
}
#services-section #fa-icon .icon {
width: 50%;
margin: 0 0 15% 0;
padding: 0;
font-size: 1em;
color: #f26da5;
float: left;
}
#specials {
height: 400px;
padding: 0;
float: right;
}
#work-section .slider img {
width: 46%;
margin: 2%;
float: left;
}
}
@media screen and (min-width: 900px) and (max-width: 999px) {
/* ********************************* Scrollstop Styles ********************************* */
.scroll img {
visibility: visible;
}
/* ************************************ Logo Styles ************************************ */
#logo-container {
width: 30%;
margin: 15% 35%;
}
#logo-container img {
opacity: 1;
}
/* ************************************ Menu Styles ************************************ */
nav {
background-color: initial;
}
nav a {
font-size: 1em;
}
nav ul li a:hover {
outline: 1px solid #ffffff;
}
#nav-bkg img {
visibility: visible;
}
/* ******************************** Main Content Styles ******************************** */
#services-section {
margin: 5% 10% 25% 10%;
padding: 10% 0 20% 0;
border-bottom: 1px solid #ffffff;
}
#services-section {
width: 80%;
margin: 5%;
padding: 5%;
height: 350px;
border: none;
}
#services-section #fa-icon .icon {
width: 25%;
margin: 0 0 15% 0;
padding: 0;
font-size: 1em;
color: #f26da5;
float: left;
}
#specials {
width: 80%;
margin: 5%;
padding: 5%;
height: 350px;
float: right;
}
#work-section {
padding-bottom: 5%;
}
#work-section .slider img {
width: 23%;
margin: 1%;
float: left;
}
#contact-section .subtitle {
margin-bottom: 10%;
}
#contactform {
margin-top: 5%;
}
}
2 个解决方案
解决方案1
0 2015-09-17 17:31:45
Because both sections are defined as min-width, both sections will be applied when the display area is over 1000px and only the min-width:300 section will be applied when it is over 300px. 因为两个部分都定义为最小宽度，所以当显示区域超过1000px时将应用两个部分，而当显示区域超过300px时将仅应用min-width：300部分。
Since both sections are applied, the browser will resort to the standard css rules for prioritization of similar styles. 由于两个部分都适用，因此浏览器将诉诸于标准css规则来对相似样式进行优先级排序。 (see http://www.w3.org/TR/2011/REC-CSS2-20110607/cascade.html#cascade ) （请参阅http://www.w3.org/TR/2011/REC-CSS2-20110607/cascade.html#cascade ）
If you want to be more explicit, you could specify: 如果要更明确，可以指定：
@media screen and (min-width: 300px) and (max-width: 999px)
and your responsive styles will stop getting applied after that point. 之后您的响应式样式将停止应用。
------------------ edit in response to comment: ------------------编辑以回应评论：
If I am understanding what you are looking for it would require the ability to nest the @media queries, but it is not supported. 如果我了解您要查找的内容，则需要具有嵌套@media查询的功能，但不支持此功能。 eg: 例如：
@media screen and (max-width:999px)
{
@media screen and (min-width:300px)
{ }
@media screen and (min-width:600px)
{ }
@media screen and (min-width:900px)
{ }
}
This way your responsive styles would stop at 999px but they would be cumulative up until that point? 这样，您的响应式样式将停止在999px处，但是直到那一点它们会一直累积？ I believe the only way to accomplish writing this logically would be to use LESS or SCSS. 我相信，完成此逻辑写法的唯一方法是使用LESS或SCSS。 Which would compile your css and rewrite it exactly the way you are trying to avoid... I think the best you can do would be: 这将编译您的css并完全按照您要避免的方式对其进行重写...我认为您能做到的最好是：
@media screen and (min-width:300px) and (max-width:999px)
{ }
@media screen and (min-width:600px) and (max-width:999px)
{ }
@media screen and (min-width:900px) and (max-width:999px)
{ }
解决方案2
0 2015-09-22 17:29:54
Or better yet try something like this: 或者更好的尝试这样的事情：
@import url(responsive.css) screen and (max-width: 999px);
and in responsive.css: 并在响应.css中：
@media screen and (min-width:300px)
{ }
@media screen and (min-width:600px)
{ }
@media screen and (min-width:900px)
{ }
This was suggested in another thread I saw: Nesting @media rules in CSS 我在另一个线程中提出了这个建议： 在CSS中嵌套@media规则
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