我刚开始学编程，不知道如何制作类似于fonawsome的下拉菜单，fa fa-ellipsis-v
我在这里尝试了一下，但不知道这个类是如何覆盖的。
*{
margin: 0;
padding :0;
box-sizing: border-box;
}
.chat-container{
height: 100vh;
width: 100vw;
display: grid;
grid-template-rows: 10% 80% 10%;
grid-template-columns: 75% 25%;
/* grid: 'search-container chat-title' 50px
'conversation-list chat-massage-list' 1fr
'new-massage-container chat-form' 420px/ 320px 1fr;
overflow-x: hidden;
border: 1px solid black;
} */
}
#search-container
{
/* height: 60px;
width: 25%;
float: left; */
background-color: #0048aa;
box-shadow: 0 1px 3px -1px rgba(0, 0, 0, 0.75);
z-index: 1;
}
#chat-title{
background-color: rgba(217, 223, 221, 0.945);
/* height: 60px;
width: 75%;
float: left; */
color: #0048AA;
font-weight: bold;
font-size: 2.0rem;
box-shadow: 0 1px 3px -1px rgba(0, 0, 0, 0.25);
z-index: 1;
}
#conversation-list{
/*
height: 85vh;
width: 25%;
position: fixed;
float: left;
top: 60px;
left: 0; */
background-color: #0048aa;
}
#chat-form
{ /* height: 85vh;
width: 75%;
position: fixed;
float: left;
top: 60px;
left: 25%; */
border-radius: 0 0 10px 0;
background: #eee;
border-top: 1px solid rgba(0, 0, 0, 0.25);
}
/*#search-container
{
}*/
#new-massage-container{
/* height: 40px;
width: 25%;
position: fixed;
float: left;
bottom: 0;
left: 0; */
background-color: #0048aa;
box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.25);
z-index: 1;
/* border-top: 1px solid rgba(0, 0, 0, 0.25);
border-radius: 0 0 0 10px;
background-color: rgb(221, 43, 43);*/
}
#chat-list{
background-color: rgba(217, 223, 221, 0.945);
}
#profile_img{
margin: 7px 18px;
border-radius: 50%;
}
i{
}
.dropbtn {
font-size: 16px;
border: none;
cursor: pointer;
background: transparent;
border: 0 none;
font-weight: inherit;
margin: 0;
padding: 0;
border: 0;
outline: 0;
vertical-align: top;
}
.dropbtn:hover, .dropbtn:focus {
background-color: #2980B9;
}
.dropdown {
position: relative;
display: inline-block;
margin-left: 190px;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f1f1f1;
min-width: 160px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown a:hover {background-color: #ddd;}
.show {display: block;}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" type="text/css" href="css/chat.css" >
<title>Chatkaro1</title>
</head>
<body>
<div class="chat-container">
<div id="chat-title">
chat
</div>
<div id="search-container">
<img id="profile_img" src="images/2.png" alt="image" style="width: 50px;">
<div class="dropdown">
<button href=""><i onclick="myFunction()" style="float: right;" class="fa fa-ellipsis-v fa-lg dropbtn"></i></button>
<div id="myDropdown" class="dropdown-content">
<a href="#home">Home</a>
<a href="#about">About</a>
<a href="#contact">Contact</a>
</div>
</div>
<script>
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}
</script>
</div>
<div id="chat-form">
form
</div>
<div id="conversation-list">
conversation
</div>
<div id="chat-list">
list
</div>
<div id="new-massage-container">
massage
</div>
</div>
</body>
</html>
谢谢！