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html - 背景图像渐变不起作用

转载 作者：行者123 更新时间：2023-11-28 00:02:22 26 4
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我正在尝试修改默认的 ASP.NET MVC4 网站模板，但我无法弄清楚为什么我的 css 无法正常工作。这可能是菜鸟的错误。我一直在搜索并尝试修复它几个小时，但我无法弄清楚。

渐变适用于页脚，但不适用于页眉。我希望从黑色边框到主要内容(标题元素内的所有内容)的所有内容都将其背景作为一个大渐变。即使备用背景颜色也不起作用，但是当我将浏览器窗口缩小到移动尺寸时，它(颜色，而不是渐变)确实起作用。有什么想法吗？

HTML:

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title>Home Page - Test</title>
        <link href="/favicon.ico" rel="shortcut icon" type="image/x-icon" />
        <meta name="viewport" content="width=device-width" />
        <link href="/Content/site.css" rel="stylesheet"/>

        <script src="/Scripts/modernizr-2.6.2.js"></script>

    </head>
    <body>
        <header>
            <div class="content-wrapper">
                <div class="float-left">
                    <p class="site-title"><a href="/">Test</a></p>
                </div>
                <div class="float-right">
                    <section id="login">
                       Hei, <span class="username">Anonymous</span>!
                    </section>
                    <nav>
                        <ul id="menu">
                            <li><a href="/">Home</a></li>
                            <li><a href="/Home/About">About</a></li>
                            <li><a href="/Home/Contact">Contact</a></li>
                        </ul>
                    </nav>
                </div>
            </div>
        </header>
        <div id="body">
            <!---->
            <section class="content-wrapper main-content clear-fix">


<h3>We suggest the following:</h3>
<ol class="round">
    <li class="one">
        <h5>Getting Started</h5>
        ASP.NET MVC gives you a powerful, patterns-based way to build dynamic websites that
        enables a clean separation of concerns and that gives you full control over markup
        for enjoyable, agile development. ASP.NET MVC includes many features that enable
        fast, TDD-friendly development for creating sophisticated applications that use
        the latest web standards.
        <a href="http://go.microsoft.com/fwlink/?LinkId=245151">Learn more…</a>
    </li>

    <li class="two">
        <h5>Add NuGet packages and jump-start your coding</h5>
        NuGet makes it easy to install and update free libraries and tools.
        <a href="http://go.microsoft.com/fwlink/?LinkId=245153">Learn more…</a>
    </li>

    <li class="three">
        <h5>Find Web Hosting</h5>
        You can easily find a web hosting company that offers the right mix of features
        and price for your applications.
        <a href="http://go.microsoft.com/fwlink/?LinkId=245157">Learn more…</a>
    </li>
</ol>

            </section>
        </div>
        <footer>
            <div class="content-wrapper">
                <div class="float-left">
                    <p>&copy; 2013 - Test</p>
                </div>
                <div class="float-right">
                    <p>Under development. ALPHA</p>
                </div>
            </div>
        </footer>

        <!--<script src="/Scripts/jquery-1.8.2.js"></script>

        -->


</body>
</html>

CSS:

html {
    background-color: #e2e2e2;
    margin: 0;
    padding: 0;
}

body {
    /*background-color: #7ac0da;*/
    border-top: solid 10px #000;
    color: #333;
    font-size: .85em;
    font-family: "Segoe UI", Verdana, Helvetica, Sans-Serif;
    margin: 0;
    padding: 0;
}

a {
    color: #333;
    outline: none;
    padding-left: 3px;
    padding-right: 3px;
    text-decoration: underline;
}

    a:link, a:visited,
    a:active, a:hover {
        color: #333;
    }

/*header, footer, hgroup,
nav, section {
    display: block;
}*/

mark {
    background-color: #a6dbed;
    padding-left: 5px;
    padding-right: 5px;
}

.float-left {
    float: left;
}

.float-right {
    float: right;
}

.clear-fix:after {
    content: ".";
    clear: both;
    display: block;
    height: 0;
    visibility: hidden;
}

h1, h2, h3,
h4, h5, h6 {
    color: #000;
    margin-bottom: 0;
    padding-bottom: 0;
}

h1 {
    font-size: 2em;
}

h2 {
    font-size: 1.75em;
}

h3 {
    font-size: 1.2em;
}

h4 {
    font-size: 1.1em;
}

h5, h6 {
    font-size: 1em;
}

    h5 a:link, h5 a:visited, h5 a:active {
        padding: 0;
        text-decoration: none;
    }


/* main layout
----------------------------------------------------------*/
.content-wrapper {
    margin: 0 auto;
    max-width: 960px;
}

header .content-wrapper {
    margin-top: 20px;
    background-color: #7ac0da;
    background-image: -ms-linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
    background-image: -o-linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
    background-image: -webkit-gradient(linear, left top, right top, color-stop(0, #7ac0da), color-stop(1, #a4d4e6));
    background-image: -webkit-linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
    background-image: -moz-linear-gradient(0% 0% 0deg,#7AC0DA, #a4d4e6);
    /*background-image: linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);*/
}

#body {
    background-color: #efeeef;
    clear: both;
    padding-bottom: 35px;
}

footer {
    clear: both;
    font-size: .8em;
    height: 100px;
    background-image: -ms-linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
    background-image: -o-linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
    background-image: -webkit-gradient(linear, left top, right top, color-stop(0, #7ac0da), color-stop(1, #a4d4e6));
    background-image: -webkit-linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
    background-image: -moz-linear-gradient(0% 0% 0deg,#7AC0DA, #a4d4e6);
    background-image: linear-gradient(left, #7ac0da 0%, #a4d4e6 100%);
}


/* site title
----------------------------------------------------------*/
.site-title {
    color: #fff;
    font-family: Rockwell, Consolas, "Courier New", Courier, monospace;
    font-size: 2.3em;
    margin: 0;
}

.site-title a, .site-title a:hover, .site-title a:active {
    color: #fff;
    outline: none;
    text-decoration: none;
}


/* login
----------------------------------------------------------*/
#login {
    display: block;
    font-size: .85em;
    margin: 0 0 10px;
    text-align: right;
}

    #login a {
        background-color: #d3dce0;
        margin-left: 10px;
        margin-right: 3px;
        padding: 2px 3px;
        text-decoration: none;
    }

    #login a.username {
        background: none;
        margin: 0;
        padding: 0;
        text-decoration: underline;
    }

    #login ul {
        margin: 0;
    }

    #login li {
        display: inline;
        list-style: none;
    }


/* menu
----------------------------------------------------------*/
ul#menu {
    font-size: 1.3em;
    font-weight: 600;
    margin: 0 0 5px;
    padding: 0;
    text-align: right;
}

    ul#menu li {
        display: inline;
        list-style: none;
        padding-left: 15px;
    }

        ul#menu li a {
            color: #fff;
            text-decoration: none;
        }

        ul#menu li a:hover {
            color: #333;
            text-decoration: none;
        }

/* page titles */
hgroup.title {
    margin-bottom: 10px;
}

hgroup.title h1, hgroup.title h2 {
    display: inline;
}

hgroup.title h2 {
    font-weight: normal;
    margin-left: 3px;
}

/* features */
section.feature {
    width: 300px;
    float: left;
    padding: 10px;
}

/* ordered list */
ol.round {
    list-style-type: none;
    padding-left: 0;
}

    ol.round li {
        margin: 25px 0;
        padding-left: 45px;
    }

        ol.round li.zero {
            background: url("../Images/orderedList0.png") no-repeat;
        }

        ol.round li.one {
            background: url("../Images/orderedList1.png") no-repeat;
        }

        ol.round li.two {
            background: url("../Images/orderedList2.png") no-repeat;
        }

        ol.round li.three {
            background: url("../Images/orderedList3.png") no-repeat;
        }

        ol.round li.four {
            background: url("../Images/orderedList4.png") no-repeat;
        }

        ol.round li.five {
            background: url("../Images/orderedList5.png") no-repeat;
        }

        ol.round li.six {
            background: url("../Images/orderedList6.png") no-repeat;
        }

        ol.round li.seven {
            background: url("../Images/orderedList7.png") no-repeat;
        }

        ol.round li.eight {
            background: url("../Images/orderedList8.png") no-repeat;
        }

        ol.round li.nine {
            background: url("../Images/orderedList9.png") no-repeat;
        }

/* content */
article {
    float: left;
    width: 70%;
}

aside {
    float: right;
    width: 25%;
}

    aside ul {
        list-style: none;
        padding: 0;
    }

        aside ul li {
            background: url("../Images/bullet.png") no-repeat 0 50%;
            padding: 2px 0 2px 20px;
        }

.label {
    font-weight: 700;
}

/* login page */
#loginForm {
    border-right: solid 2px #c8c8c8;
    float: left;
    width: 55%;
}

    #loginForm .validation-error {
        display: block;
        margin-left: 15px;
    }

    #loginForm .validation-summary-errors ul {
        margin: 0;
        padding: 0;
    }

    #loginForm .validation-summary-errors li {
        display: inline;
        list-style: none;
        margin: 0;
    }

    #loginForm input {
        width: 250px;
    }

    #loginForm input[type="checkbox"],
    #loginForm input[type="submit"],
    #loginForm input[type="button"],
    #loginForm button {
        width: auto;
    }

#socialLoginForm {
    margin-left: 40px;
    float: left;
    width: 40%;
}

    #socialLoginForm h2 {
        margin-bottom:  5px;
    }

#socialLoginList button {
    margin-bottom: 12px;
}

#logoutForm {
    display: inline;
}

/* contact */
.contact h3 {
    font-size: 1.2em;
}

.contact p {
    margin: 5px 0 0 10px;
}

.contact iframe {
    border: 1px solid #333;
    margin: 5px 0 0 10px;
}

/* forms */
fieldset {
    border: none;
    margin: 0;
    padding: 0;
}

    fieldset legend {
        display: none;
    }

    fieldset ol {
        padding: 0;
        list-style: none;
    }

        fieldset ol li {
            padding-bottom: 5px;
        }

label {
    display: block;
    font-size: 1.2em;
    font-weight: 600;
}

label.checkbox {
    display: inline;
}

input, textarea {
    border: 1px solid #e2e2e2;
    background: #fff;
    color: #333;
    font-size: 1.2em;
    margin: 5px 0 6px 0;
    padding: 5px;
    width: 300px;
}

textarea {
    font-family: inherit;
    width: 500px;
}

    input:focus, textarea:focus {
        border: 1px solid #7ac0da;
    }

    input[type="checkbox"] {
        background: transparent;
        border: inherit;
        width: auto;
    }

    input[type="submit"],
    input[type="button"],
    button {
        background-color: #d3dce0;
        border: 1px solid #787878;
        cursor: pointer;
        font-size: 1.2em;
        font-weight: 600;
        padding: 7px;
        margin-right: 8px;
        width: auto;
    }

    td input[type="submit"],
    td input[type="button"],
    td button {
        font-size: 1em;
        padding: 4px;
        margin-right: 4px;
    }

/* info and errors */
.message-info {
    border: 1px solid;
    clear: both;
    padding: 10px 20px;
}

.message-error {
    clear: both;
    color: #e80c4d;
    font-size: 1.1em;
    font-weight: bold;
    margin: 20px 0 10px 0;
}

.message-success {
    color: #7ac0da;
    font-size: 1.3em;
    font-weight: bold;
    margin: 20px 0 10px 0;
}

.error {
    color: #e80c4d;
}

/* styles for validation helpers */
.field-validation-error {
    color: #e80c4d;
    font-weight: bold;
}

.field-validation-valid {
    display: none;
}

input.input-validation-error {
    border: 1px solid #e80c4d;
}

input[type="checkbox"].input-validation-error {
    border: 0 none;
}

.validation-summary-errors {
    color: #e80c4d;
    font-weight: bold;
    font-size: 1.1em;
}

.validation-summary-valid {
    display: none;
}


/* tables
----------------------------------------------------------*/
table {
    border-collapse: collapse;
    border-spacing: 0;
    margin-top: 0.75em;
    border: 0 none;
}

th {
    font-size: 1.2em;
    text-align: left;
    border: none 0px;
    padding-left: 0;
}

    th a {
        display: block;
        position: relative;
    }

    th a:link, th a:visited, th a:active, th a:hover {
        color: #333;
        font-weight: 600;
        text-decoration: none;
        padding: 0;
    }

    th a:hover {
        color: #000;
    }

    th.asc a, th.desc a {
        margin-right: .75em;
    }

    th.asc a:after, th.desc a:after {
        display: block;
        position: absolute;
        right: 0em;
        top: 0;
        font-size: 0.75em;
    }

    th.asc a:after {
        content: '▲';
    }

    th.desc a:after {
        content: '▼';
    }

td {
    padding: 0.25em 2em 0.25em 0em;
    border: 0 none;
}

tr.pager td {
    padding: 0 0.25em 0 0;
}


/********************
*   Mobile Styles   *
********************/
@media only screen and (max-width: 850px) {

    /* header
    ----------------------------------------------------------*/
    header .float-left,
    header .float-right {
        float: none;
    }

    /* logo */
    header .site-title {
        margin: 10px;
        text-align: center;
    }

    /* login */
    #login {
        font-size: .85em;
        margin: 0 0 12px;
        text-align: center;
    }

        #login ul {
            margin: 5px 0;
            padding: 0;
        }

        #login li {
            display: inline;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        #login a {
            background: none;
            color: #999;
            font-weight: 600;
            margin: 2px;
            padding: 0;
        }

        #login a:hover {
            color: #333;
        }

    /* menu */
    nav {
        margin-bottom: 5px;
    }

    ul#menu {
        margin: 0;
        padding: 0;
        text-align: center;
    }

        ul#menu li {
            margin: 0;
            padding: 0;
        }


    /* main layout
    ----------------------------------------------------------*/
    .main-content,
    .featured + .main-content {
        background-position: 10px 0;
    }

    .content-wrapper {
        padding-right: 10px;
        padding-left: 10px;
    }

    .featured .content-wrapper {
        padding: 10px;
    }

    /* page content */
    article, aside {
        float: none;
        width: 100%;
    }

    /* ordered list */
    ol.round {
        list-style-type: none;
        padding-left: 0;
    }

        ol.round li {
            padding-left: 10px;
            margin: 25px 0;
        }

            ol.round li.zero,
            ol.round li.one,
            ol.round li.two,
            ol.round li.three,
            ol.round li.four,
            ol.round li.five,
            ol.round li.six,
            ol.round li.seven,
            ol.round li.eight,
            ol.round li.nine {
                background: none;
            }

     /* features */
     section.feature {
        float: none;
        padding: 10px;
        width: auto;
     }

        section.feature img {
            color: #999;
            content: attr(alt);
            font-size: 1.5em;
            font-weight: 600;
        }

    /* forms */
    input {
        width: 90%;
    }

    /* login page */
    #loginForm {
        border-right: none;
        float: none;
        width: auto;
    }

        #loginForm .validation-error {
            display: block;
            margin-left: 15px;
        }

    #socialLoginForm {
        margin-left: 0;
        float: none;
        width: auto;
    }


    /* footer
    ----------------------------------------------------------*/
    footer .float-left,
    footer .float-right {
        float: none;
    }

    footer {
        text-align: center;
        height: auto;
        padding: 10px 0;
    }

        footer p {
            margin: 0;
        }
}

最佳答案

问题

我解决了你的问题。当涉及到 float 时要小心这些属性可能会破坏您的布局 - 如果您之后不应用适当的清除。当您为 h3 元素设置 margin-top 值导致 footer 位于更下方时，就会出现边距问题。通常边距不会影响元素的实际尺寸。 页脚 也是如此，背景仅与页脚的尺寸一样大。

在这里找到我的解决方案:

http://jsfiddle.net/w4Jgh/

Clearfix

What methods of ‘clearfix’ can I use?

http://www.impressivewebs.com/clearing-floats-why-necessary/

最好的问候

关于html - 背景图像渐变不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20641378/

26 4 0
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