更改了菜单栏颜色，现在将鼠标悬停在按钮上时无法再看到菜单

Question

>我有一个菜单栏，其中包含一个按钮，当将鼠标悬停在上面时，会显示菜单项列表。

我最近将菜单栏的颜色从纯色更改为具有渐变等的更现代的颜色。

我还把我的按钮改成了相同的颜色。但是，当我将鼠标悬停在菜单上时，不再显示任何内容。我不明白为什么更改颜色会这样做以及如何再次看到菜单？

这是我的小提琴

新颜色

/* Dropdown Button */
.dropbtn {
-moz-box-shadow:inset 0px 1px 0px 0px #dcecfb;
-webkit-box-shadow:inset 0px 1px 0px 0px #dcecfb;
box-shadow:inset 0px 1px 0px 0px #dcecfb;
background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #bddbfa), color-stop(1, #80b5ea));
background:-moz-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:-webkit-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:-o-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:-ms-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:linear-gradient(to bottom, #bddbfa 5%, #80b5ea 100%);
background-color:#bddbfa;
color: white;
padding: 16px;
font-size: 16px;
border: none;
}

更改之前

/* Dropdown Button */
.dropbtn {
background-color: #9FACEC;
color: white;
padding: 16px;
font-size: 16px;
border: none;
}

Answer 1

我认为这与颜色变化无关，只是在更新时可能出现的轻微意外 html 代码调整。
我有点困惑，有一个外部div 似乎什么都不做(没有关联的 css 类(，我删除了它。在我这样做并在您的 html 中移动一个单独的结束</div>标签后，只需要对 css 类进行少量更新即可完成这项工作(我将下拉类移到 css 中并包含position:relative..小事情(。

这是工作代码和小提琴

body {
padding: 0px;
margin: 0px;
}
/*padding: 6px 5px;*/
.navbar {
width: 50%;
display: block;
margin: 0px;
padding: 0px;
transition: all 0.5s;
-webkit-transition: all 0.5s;
}
.navbar div {
height: 5px !important;
background: #fff;
margin: 7px 0px 7px 0px;
border-radius: 25px;
transition: all 0.5s;
-webkit-transition: all 0.5s;
}
.two {
width: 35px;
}
.three {
width: 50px;
}
.navbar:hover div {
width: 60px;
}
/* The container <div> - needed to position the dropdown content */
.dropdown {
position: relative;
display: inline-block;
}
/* Dropdown Button */
.dropbtn {
-moz-box-shadow: inset 0px 1px 0px 0px #dcecfb;
-webkit-box-shadow: inset 0px 1px 0px 0px #dcecfb;
box-shadow: inset 0px 1px 0px 0px #dcecfb;
background: -webkit-gradient(linear, left top, left bottom, color-stop(0.05, #bddbfa), color-stop(1, #80b5ea));
background: -moz-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: -webkit-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: -o-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: -ms-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: linear-gradient(to bottom, #bddbfa 5%, #80b5ea 100%);
background-color: #bddbfa;
color: white;
padding: 16px;
font-size: 16px;
border: none;
}
.dropbtnSub {
background-color: red;
color: black;
padding: 16px;
font-size: 16px;
border: none;
width: 100%;
}
/* Dropdown Content (Hidden by Default) */
.dropdown-content {
display: none;
position: fixed;
background-color: red;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
z-index: 1;
}
/* Links inside the dropdown */
.dropdown-content li {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
position: relative;
}
/* Change color of dropdown links on hover */
.dropdown-content li:hover {
background-color: #ddd;
}
/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {
display: block;
}
/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn {
background-color: yellow;
}
.dropdown-content-list {
display: none;
}
.dropdown-content-list:hover {
display: block !important;
}
.dropdown-content-li:hover .dropdown-content-list {
display: block;
position: absolute;
left: 100%;
top: 0;
background: yellow;
}
ul {
padding-left: 0;
}
/*background-color: #9FACEC;    /* Medium blue */
#menu {
-moz-box-shadow: inset 0px 1px 0px 0px #dcecfb;
-webkit-box-shadow: inset 0px 1px 0px 0px #dcecfb;
box-shadow: inset 0px 1px 0px 0px #dcecfb;
background: -webkit-gradient(linear, left top, left bottom, color-stop(0.05, #bddbfa), color-stop(1, #80b5ea));
background: -moz-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: -webkit-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: -o-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: -ms-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background: linear-gradient(to bottom, #bddbfa 5%, #80b5ea 100%);
background-color: #bddbfa;
position: fixed;
width: 100%;
margin: 0;
z-index: 1;
display: flex;
justify-content: center;
overflow: hidden;
top: 0;
}
.sidebar {
height: 300px;
background-color: Red;
/* Red */
}
/*height: 500px;*/
.content {
/*background-color: #F5CF8E;    /* Yellow */
background-color: yellow;
/* Yellow */
overflow: hidden;
max-height: 800px;
}
.page {
width: 90%;
margin: 0 auto;
overflow: hidden;
position: relative;
display: block;
}
.headerLbl {
align-self: center;
width: 90%;
text-align: center;
font-weight: bold;
color: white;
font-size: 14pt;
font-family: Arial;
}

<body>
<div id="menu">
<div class="dropdown">
<button class="dropbtn">
<div class="navbar">
<div class="one"></div>
<div class="two"></div>
<div class="three"></div>
</div>
</button>
<div class="dropdown-content">
<ul>
<li class="dropdown-content-li">
<button class="dropbtnSub">Region</button>
<div class="dropdown-content-list">
<ul>
<li>Japan</li>
<li>Europe</li>
<li>USD</li>
</ul>
</div>
</li>
<li class="dropdown-content-li">
<button class="dropbtnSub">Export</button>
<div class="dropdown-content-list">
<ul>
<li>Excel</li>
<li>CSV</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
<div id="lblContainer" class="headerLbl">
My label
</div>
<div class="page">
</div>
</div>
</body>

希望这有帮助

Answer 2

使用 ：hover 并给出您可以在上面识别的颜色

.dropdown:hover{
write your code here;
}

Answer 3

<style>
.dropbtn {
-moz-box-shadow:inset 0px 1px 0px 0px #dcecfb;
-webkit-box-shadow:inset 0px 1px 0px 0px #dcecfb;
box-shadow:inset 0px 1px 0px 0px #dcecfb;
background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #bddbfa), 
color-stop(1, #80b5ea));
background:-moz-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:-webkit-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:-o-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:-ms-linear-gradient(top, #bddbfa 5%, #80b5ea 100%);
background:linear-gradient(to bottom, #bddbfa 5%, #80b5ea 100%);
background-color:#bddbfa;
color: white;
padding: 16px;
font-size: 16px;
border: none;
}
.dropbtn:hover
{
-moz-box-shadow:inset 0px 1px 0px 0px #dcecfb;
-webkit-box-shadow:inset 0px 1px 0px 0px #dcecfb;
box-shadow:inset 0px 1px 0px 0px #dcecfb;
background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #9FACEC), 
color-stop(1, #80b5ea));
background:-moz-linear-gradient(top, #9FACEC 5%, #80b5ea 100%);
background:-webkit-linear-gradient(top, #9FACEC 5%, #80b5ea 100%);
background:-o-linear-gradient(top, #9FACEC 5%, #80b5ea 100%);
background:-ms-linear-gradient(top, #9FACEC 5%, #80b5ea 100%);
background:linear-gradient(to bottom, #9FACEC 5%, #80b5ea 100%);
background-color: #9FACEC;
color: white;
padding: 16px;
font-size: 16px;
border: none;
}

<html>
<body>
<input class="dropbtn" type="button" value="button"/>
</body>
</html>

上面的代码工作检查