基本上我想尝试在三个不同的区域拥有相同的rgba值。我希望我的身体，导航和页脚都有rgba（0,0,0，.8）。
我的身体有效，但导航和页脚显示的是纯黑色而没有透明度......
我尝试稍微改变透明度，以便它们不同但不起作用。
你只允许使用一次吗？
乔
@font-face {
font-family: 'telegraficoregular';
src: url('../FONTS/telegrafico-webfont.eot');
src: url('../FONTS/telegrafico-webfont.eot?#iefix') format('embedded-opentype'),
url('../FONTS/telegrafico-webfont.woff2') format('woff2'),
url('../FONTS/telegrafico-webfont.woff') format('woff'),
url('../FONTS/telegrafico-webfont.ttf') format('truetype'),
url('../FONTS/telegrafico-webfont.svg#telegraficoregular') format('svg');
font-weight: normal;
font-style: normal;
}
.cf:after {
content: "";
display: table;
clear: both;
}
html, body, head, nav, article, aside, section, h3, h4, footer, ul, li {
margin: 0;
padding: 0;
}
/*Global Styles*/
html {
margin: 0;
padding: 0;
}
body {
width: 100%;
margin: 0 auto;
padding: 0;
background:rgba(0,0,0,.9);
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
}
h1 {
font-family: telegraficoregular;
font-size: 3em;
color: rgb(50,153,187);
padding: 0;
margin:0;
text-align: center;
}
h2 {
font-family: telegraficoregular;
font-size: 1em;
font-style: italic;
color: #003366;
padding: 0;
margin: 0;
text-align: center;
}
p {
font-family: serif;
font-size: 1.1em;
color: black;
text-align:left;
padding-left:70px;
}
h4 + p {
font-family: serif;
font-size: 1.1em;
color: black;
text-align:left;
padding-left:70px;
padding-top: 10px;
}
/*Nav Styles */
header {
background:rgb(233,233,233);
width: 100%;
height: 160px;
margin:0 auto;
}
nav {
background:rgba(0,0,0,.8);
width: auto;
height: 64px;
}
nav ul.TopMenu li {
float: left;
list-style: none;
width: 150px;
}
nav ul.TopMenu {
width: 600px;
margin: 0 auto;
}
nav ul.TopMenu li a {
display:block;
line-height: 64px;
padding:0 2em;
text-align: center;
font-family: telegraficoregular;
font-size: 1.2em;
text-decoration: none;
}
li {
position: relative;
}
nav ul.SubMenu{
float: none;
text-align: center;
border-bottom: 1px solid white;
position: absolute;
left: -9000em;
top: 64px;
height: auto;
max-height: 0;
-moz-transition: max-height 0.5s ease-in-out;
-webkit-transition: max-height 0.5s ease-in-out;
-o-transition: max-height 0.5s ease-in-out;
transition: max-height 0.5s ease-in-out;
overflow:hidden;
z-index:999;
}
nav ul.SubMenu li{
height: 32px;
font-family: telegraficoregular;
font-size: 1em;
padding: 0;
margin: 0;
border-bottom: 1px solid white;
}
nav ul.SubMenu li a{
display:block;
line-height: 32px;
padding: 0px;
margin: 0;
}
.TopMenu li:hover ul{
left: 0;
max-height: 20em;
}
ul.SubMenu li a{
background: rgba(0,0,0,.8);
border-bottom: 1px solid white;
}
ul.SubMenu li a:visited {
color: white;
}
ul.SubMenu li a:hover {
background: rgba(255,165,0,.8);
}
a:visited {
color: white;
}
a:hover {
color: orange;
}
/* Article Styles */
article {
width: 896px;
padding: 32px;
}
/*Section Styles */
section.China {
text-align: center;
margin: 20px auto;
padding: 20px;
}
section h3 {
font-family: telegraficoregular;
font-size: 2em;
border-bottom: 1px solid black;
padding: 5px;
}
section h4 {
font-family: telegraficoregular;
font-size: 1.4em;
padding-top: 60px;
padding-left: 70px;
text-align: left;
text-decoration: underline;
}
section.China img {
position: relative;
top: 20px;
border-radius: 5px;
}
section.Australia {
text-align: center;
margin: 20px auto;
padding: 20px;
}
section.Australia img {
position: relative;
top: 20px;
border-radius: 5px;
}
section.Thailand {
text-align: center;
margin: 20px auto;
padding: 20px;
}
section.Thailand img {
position: relative;
top: 20px;
border-radius: 5px;
}
/* Link Styles*/
/* About Styles */
#AboutContent{
width: 960px;
height: 1200px;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
#AboutHeader {
text-align: center;
margin: 20px auto;
padding: 20px;
}
#AboutHeader img {
display: block;
margin: 0 auto;
text-align: center;
}
#AboutHeader h2 {
font-family: telegraficoregular;
font-size: 1.5em;
text-decoration: underline;
color: black;
padding: 0;
margin-top: 20px;
text-align: center;
}
h2 + img {
position: relative;
top: 50px;
border-radius: 5px;
}
#AboutHeader p {
font-family: serif;
font-size: 1.1em;
color: black;
text-align:left;
padding:50px 0 0 100px;
}
/*Photos Content */
#PhotoContent{
width: 960px;
height:auto;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
/* Photos Gallery */
#ChinaPhotos {
width: 960px;
height:1200px;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
#ChinaPhotos h3 {
font-family: telegraficoregular;
font-size: 2em;
border-bottom: 1px solid black;
padding: 5px;
text-align: center;
margin-top: 20px;
}
#ChinaPhotos img {
margin-top: 20px;
border: 1px solid black;
}
#ChinaPhotos a .Thumb:hover {
width: 320px;
height: 240px;
}
/* Container Styles */
#Content {
width: 960px;
height: auto;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
/* Footer Styles */
.Footer {
width: 100%;
height: 80px;
background: rgba(0,0,0,.7);
}
.Footer p {
font-family: telegraficoregular;
color: white;
font-style: italic;
line-height: 80px;
text-align: center;
}
答案 0 :(得分：0)
所以，它看起来好像是导致你出现问题的重叠（见上面的评论。我改变了导航和页脚中的背景颜色，它们只显示出来。
事实上，你有两个重叠80％不透明度的元素，结果看起来是黑色的。
html, body, head, nav, article, aside, section, h3, h4, footer, ul, li {
margin: 0;
padding: 0;
}
/*Global Styles*/
html {
margin: 0;
padding: 0;
}
body {
width: 100%;
margin: 0 auto;
padding: 0;
background:rgba(0,0,0,.9);
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
}
h1 {
font-family: telegraficoregular;
font-size: 3em;
color: rgb(50,153,187);
padding: 0;
margin:0;
text-align: center;
}
h2 {
font-family: telegraficoregular;
font-size: 1em;
font-style: italic;
color: #003366;
padding: 0;
margin: 0;
text-align: center;
}
p {
font-family: serif;
font-size: 1.1em;
color: black;
text-align:left;
padding-left:70px;
}
h4 + p {
font-family: serif;
font-size: 1.1em;
color: black;
text-align:left;
padding-left:70px;
padding-top: 10px;
}
/*Nav Styles */
header {
background:rgb(233,233,233);
width: 100%;
height: 160px;
margin:0 auto;
}
nav {
background:rgba(255,0,0,.8);
width: auto;
height: 64px;
}
nav ul.TopMenu li {
float: left;
list-style: none;
width: 150px;
}
nav ul.TopMenu {
width: 600px;
margin: 0 auto;
}
nav ul.TopMenu li a {
display:block;
line-height: 64px;
padding:0 2em;
text-align: center;
font-family: telegraficoregular;
font-size: 1.2em;
text-decoration: none;
}
li {
position: relative;
}
nav ul.SubMenu{
float: none;
text-align: center;
border-bottom: 1px solid white;
position: absolute;
left: -9000em;
top: 64px;
height: auto;
max-height: 0;
-moz-transition: max-height 0.5s ease-in-out;
-webkit-transition: max-height 0.5s ease-in-out;
-o-transition: max-height 0.5s ease-in-out;
transition: max-height 0.5s ease-in-out;
overflow:hidden;
z-index:999;
}
nav ul.SubMenu li{
height: 32px;
font-family: telegraficoregular;
font-size: 1em;
padding: 0;
margin: 0;
border-bottom: 1px solid white;
}
nav ul.SubMenu li a{
display:block;
line-height: 32px;
padding: 0px;
margin: 0;
}
.TopMenu li:hover ul{
left: 0;
max-height: 20em;
}
ul.SubMenu li a{
background: rgba(0,0,0,.8);
border-bottom: 1px solid white;
}
ul.SubMenu li a:visited {
color: white;
}
ul.SubMenu li a:hover {
background: rgba(255,165,0,.8);
}
a:visited {
color: white;
}
a:hover {
color: orange;
}
/* Article Styles */
article {
width: 896px;
padding: 32px;
}
/*Section Styles */
section.China {
text-align: center;
margin: 20px auto;
padding: 20px;
}
section h3 {
font-family: telegraficoregular;
font-size: 2em;
border-bottom: 1px solid black;
padding: 5px;
}
section h4 {
font-family: telegraficoregular;
font-size: 1.4em;
padding-top: 60px;
padding-left: 70px;
text-align: left;
text-decoration: underline;
}
section.China img {
position: relative;
top: 20px;
border-radius: 5px;
}
section.Australia {
text-align: center;
margin: 20px auto;
padding: 20px;
}
section.Australia img {
position: relative;
top: 20px;
border-radius: 5px;
}
section.Thailand {
text-align: center;
margin: 20px auto;
padding: 20px;
}
section.Thailand img {
position: relative;
top: 20px;
border-radius: 5px;
}
/* Link Styles*/
/* About Styles */
#AboutContent{
width: 960px;
height: 1200px;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
#AboutHeader {
text-align: center;
margin: 20px auto;
padding: 20px;
}
#AboutHeader img {
display: block;
margin: 0 auto;
text-align: center;
}
#AboutHeader h2 {
font-family: telegraficoregular;
font-size: 1.5em;
text-decoration: underline;
color: black;
padding: 0;
margin-top: 20px;
text-align: center;
}
h2 + img {
position: relative;
top: 50px;
border-radius: 5px;
}
#AboutHeader p {
font-family: serif;
font-size: 1.1em;
color: black;
text-align:left;
padding:50px 0 0 100px;
}
/*Photos Content */
#PhotoContent{
width: 960px;
height:auto;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
/* Photos Gallery */
#ChinaPhotos {
width: 960px;
height:1200px;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
#ChinaPhotos h3 {
font-family: telegraficoregular;
font-size: 2em;
border-bottom: 1px solid black;
padding: 5px;
text-align: center;
margin-top: 20px;
}
#ChinaPhotos img {
margin-top: 20px;
border: 1px solid black;
}
#ChinaPhotos a .Thumb:hover {
width: 320px;
height: 240px;
}
/* Container Styles */
#Content {
width: 960px;
height: auto;
margin: 0 auto;
padding: 0;
background: white;
font-family: serif, arial, helvetica, georgia;
font-size: 16px;
color: black;
}
/* Footer Styles */
.Footer {
width: 100%;
height: 80px;
background: rgba(0,0,255,.5);
}
.Footer p {
font-family: telegraficoregular;
color: white;
font-style: italic;
line-height: 80px;
text-align: center;
}<nav>
<ul>
<li>something</li>
<li>something else</li>
</ul>
</nav>
<footer class="Footer">
This is a footer
</footer>