已更新
我无法弄清楚我的CSS导致错误的原因？我不确定如何解决这些问题，因为我并不熟悉它。你能看看并告诉我什么是错的吗？干杯我设法解决了大部分问题，但我只遇到了3个错误。
错误：
109 .button, button, input[type="submit"], input[type="reset"], input[type="button"] Value Error : background top is not a color value )
140 .button:hover, button:hover, input[type="submit"]:hover, input[type="reset"]:hover, input[type="button"]:hover Value Error : background top is not a color value )
157 .button:active, button:active, input[type="submit"]:active, input[type="reset"]:active, input[type="button"]:active Value Error : background top is not a color value )
我的CSS：
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline; }
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section {
display: block; }
body {
line-height: 1; }
ol, ul {
list-style: none; }
blockquote, q {
quotes: none; }
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none; }
table {
border-collapse: collapse;
border-spacing: 0; }
body {
background: #fff;
font: 14px/21px "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif;
color: #444;
-webkit-font-smoothing: antialiased;
-webkit-text-size-adjust: 100%;
}
h1, h2, h3, h4, h5, h6 {
color: #181818;
font-family: "Georgia", "Times New Roman", serif;
font-weight: normal; }
h1 a, h2 a, h3 a, h4 a, h5 a, h6 a { font-weight: inherit; }
h1 { font-size: 46px; line-height: 50px; margin-bottom: 14px;}
h2 { font-size: 35px; line-height: 40px; margin-bottom: 10px; }
h3 { font-size: 28px; line-height: 34px; margin-bottom: 8px; }
h4 { font-size: 21px; line-height: 30px; margin-bottom: 4px; }
h5 { font-size: 17px; line-height: 24px; }
h6 { font-size: 14px; line-height: 21px; }
.subheader { color: #777; }
p { margin: 0 0 20px 0; }
p img { margin: 0; }
p.lead { font-size: 21px; line-height: 27px; color: #777; }
em { font-style: italic; }
strong { font-weight: bold; color: #333; }
small { font-size: 80%; }
blockquote, blockquote p { font-size: 17px; line-height: 24px; color: #777; font-style: italic; }
blockquote { margin: 0 0 20px; padding: 9px 20px 0 19px; border-left: 1px solid #ddd; }
blockquote cite { display: block; font-size: 12px; color: #555; }
blockquote cite:before { content: "\2014 \0020"; }
blockquote cite a, blockquote cite a:visited, blockquote cite a:visited { color: #555; }
hr { border: solid #ddd; border-width: 1px 0 0; clear: both; margin: 10px 0 30px; height: 0; }
a, a:visited { color: #333; text-decoration: underline; outline: 0; }
a:hover, a:focus { color: #000; }
p a, p a:visited { line-height: inherit; }
ul, ol { margin-bottom: 20px; }
ul { list-style: none outside; }
ol { list-style: decimal; }
ol, ul.square, ul.circle, ul.disc { margin-left: 30px; }
ul.square { list-style: square outside; }
ul.circle { list-style: circle outside; }
ul.disc { list-style: disc outside; }
ul ul, ul ol,
ol ol, ol ul { margin: 4px 0 5px 30px; font-size: 90%; }
ul ul li, ul ol li,
ol ol li, ol ul li { margin-bottom: 6px; }
li { line-height: 18px; margin-bottom: 12px; }
ul.large li { line-height: 21px; }
li p { line-height: 21px; }
img.scale-with-grid {
max-width: 100%;
height: auto; }
.button,
button,
input[type="submit"],
input[type="reset"],
input[type="button"] {
background: #eee; /* Old browsers */
background: #eee -moz-linear-gradient(top, rgba(255,255,255,.2) 0%, rgba(0,0,0,.2) 100%); /* FF3.6+ */
background: #eee -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,.2)), color-stop(100%,rgba(0,0,0,.2))); /* Chrome,Safari4+ */
background: #eee -webkit-linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* Chrome10+,Safari5.1+ */
background: #eee -o-linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* Opera11.10+ */
background: #eee -ms-linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* IE10+ */
background: #eee linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* W3C */
border: 1px solid #aaa;
border-top: 1px solid #ccc;
border-left: 1px solid #ccc;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
color: #444;
display: inline-block;
font-size: 11px;
font-weight: bold;
text-decoration: none;
text-shadow: 0 1px rgba(255, 255, 255, .75);
cursor: pointer;
margin-bottom: 20px;
line-height: normal;
padding: 8px 10px;
font-family: "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif; }
.button:hover,
button:hover,
input[type="submit"]:hover,
input[type="reset"]:hover,
input[type="button"]:hover {
color: #222;
background: #ddd; /* Old browsers */
background: #ddd -moz-linear-gradient(top, rgba(255,255,255,.3) 0%, rgba(0,0,0,.3) 100%); /* FF3.6+ */
background: #ddd -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,.3)), color-stop(100%,rgba(0,0,0,.3))); /* Chrome,Safari4+ */
background: #ddd -webkit-linear-gradient(top, rgba(255,255,255,.3) 0%,rgba(0,0,0,.3) 100%); /* Chrome10+,Safari5.1+ */
background: #ddd -o-linear-gradient(top, rgba(255,255,255,.3) 0%,rgba(0,0,0,.3) 100%); /* Opera11.10+ */
background: #ddd -ms-linear-gradient(top, rgba(255,255,255,.3) 0%,rgba(0,0,0,.3) 100%); /* IE10+ */
background: #ddd linear-gradient(top, rgba(255,255,255,.3) 0%,rgba(0,0,0,.3) 100%); /* W3C */
border: 1px solid #888;
border-top: 1px solid #aaa;
border-left: 1px solid #aaa; }
.button:active,
button:active,
input[type="submit"]:active,
input[type="reset"]:active,
input[type="button"]:active {
border: 1px solid #666;
background: #ccc; /* Old browsers */
background: #ccc -moz-linear-gradient(top, rgba(255,255,255,.35) 0%, rgba(10,10,10,.4) 100%); /* FF3.6+ */
background: #ccc -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,.35)), color-stop(100%,rgba(10,10,10,.4))); /* Chrome,Safari4+ */
background: #ccc -webkit-linear-gradient(top, rgba(255,255,255,.35) 0%,rgba(10,10,10,.4) 100%); /* Chrome10+,Safari5.1+ */
background: #ccc -o-linear-gradient(top, rgba(255,255,255,.35) 0%,rgba(10,10,10,.4) 100%); /* Opera11.10+ */
background: #ccc -ms-linear-gradient(top, rgba(255,255,255,.35) 0%,rgba(10,10,10,.4) 100%); /* IE10+ */
background: #ccc linear-gradient(top, rgba(255,255,255,.35) 0%,rgba(10,10,10,.4) 100%); /* W3C */ }
.button.full-width,
button.full-width,
input[type="submit"].full-width,
input[type="reset"].full-width,
input[type="button"].full-width {
width: 100%;
padding-left: 0 !important;
padding-right: 0 !important;
text-align: center; }
button::-moz-focus-inner,
input::-moz-focus-inner {
border: 0;
padding: 0;
}
form {
margin-bottom: 20px; }
fieldset {
margin-bottom: 20px; }
input[type="text"],
input[type="password"],
input[type="email"],
textarea,
select {
border: 1px solid #ccc;
padding: 6px 4px;
outline: none;
-moz-border-radius: 2px;
-webkit-border-radius: 2px;
border-radius: 2px;
font: 13px "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif;
color: #777;
margin: 0;
width: 210px;
max-width: 100%;
display: block;
margin-bottom: 20px;
background: #fff; }
select {
padding: 0; }
input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
textarea:focus {
border: 1px solid #aaa;
color: #444;
-moz-box-shadow: 0 0 3px rgba(0,0,0,.2);
-webkit-box-shadow: 0 0 3px rgba(0,0,0,.2);
box-shadow: 0 0 3px rgba(0,0,0,.2); }
textarea {
min-height: 60px; }
label,
legend {
display: block;
font-weight: bold;
font-size: 13px; }
select {
width: 220px; }
input[type="checkbox"] {
display: inline; }
label span,
legend span {
font-weight: normal;
font-size: 13px;
color: #444; }
.remove-bottom { margin-bottom: 0 !important; }
.half-bottom { margin-bottom: 10px !important; }
.add-bottom { margin-bottom: 20px !important; }
答案 0 :(得分：2)
要设置线性渐变，您应该使用background-image属性。您还可以设置背景颜色以回退到旧版浏览器。考虑到这一点，尝试这样的事情：
background-color: #eee; /* Old browsers */
background-image: -moz-linear-gradient(top, rgba(255,255,255,.2) 0%, rgba(0,0,0,.2) 100%); /* FF3.6+ */
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,.2)), color-stop(100%,rgba(0,0,0,.2))); /* Chrome,Safari4+ */
background-image: -webkit-linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* Chrome10+,Safari5.1+ */
background-image: -o-linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* Opera11.10+ */
background-image: -ms-linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* IE10+ */
background-image: linear-gradient(top, rgba(255,255,255,.2) 0%,rgba(0,0,0,.2) 100%); /* W3C */
有关使用线性渐变的详细信息，请参阅MDN。