字体真棒：当使用hover :: before时，图标消失了

Question

我想悬停图标，这样就会显示before元素，但每当我将它悬停时，图标就会消失，当我将鼠标悬停在图标的右半部分时，没有任何反应。如果我将before改为after，它运作良好。

.container {
    background-color: lightgray;
    margin: auto;
    width: 500px;
    height: 200px;
    padding: 100px;
}

.icon {
    font-size: 50px;
    cursor: pointer;
    color: red;
}

.icon:hover::before {
    content: '';
    background-color: black;
    padding: 10px;
}

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">


<div class="container">
		<i class="fas fa-exclamation-circle icon"></i>
</div>

Answer 1

这将在悬停时添加黑色背景。您无法休息content，因为它用于显示FontAwesome的图标。

.container {
    background-color: lightgray;
    margin: auto;
    width: 500px;
    height: 200px;
    padding: 100px;
}

.icon {
    font-size: 50px;
    cursor: pointer;
    color: red;
}

.icon:hover::before {
    background-color: black;
    padding: 10px;
}

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">


<div class="container">
		<i class="fas fa-exclamation-circle icon"></i>
</div>