我正在通过 pycharm 使用 html、css 和 js 开发一个 Web 应用程序。目前我遇到了上传按钮的问题，该按钮旨在触发源代码的上传。我仍在学习，但找不到解决方案。
当您单击并按住“上传”按钮时，它会表现出不需要的视觉行为，即变成蓝色。当然，我不必按住它，但即使点击一小会儿，也会出现蓝色。
这是我的CSS代码：
.btn-primary {
background-color: #fc3e00;
border: none;
border-radius: 5px;
transition: background-color 0.3s ease, transform 0.2s ease;
color: white;
appearance: none;
}
.btn-primary:hover {
background-color: #b80c09;
}
.btn-primary:focus {
outline: none !important;
box-shadow: none !important;
background-color: #b80c09;
}
.btn-primary:active {
background-color: #b80c09;
transform: scale(0.95);
box-shadow: none !important;
}
这是 HTML：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap Link -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<!-- CSS Link -->
<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
<!-- Font Link -->
<link href="https://fonts.googleapis.com/css?family=Roboto+Mono:100,100i,300,300i,400,400i,500,500i,700,700i"
rel="stylesheet"/>
<!-- Project Name -->
<title>Viewie - Source Code Visualizer</title>
</head>
<body>
<div class="container">
<h1 class="text-center mt-4">Welcome to Viewie: A Code Source Visualizer!</h1>
<h2 class="text-center mt-4">Input your Python, Javascript, or Java Code :D</h2>
<form id="codeForm" class="mt-4">
<div class="form-group">
<textarea class="form-control" id="code" rows="10" placeholder="Please upload your source code :)"></textarea>
</div>
<button type="submit" class="btn btn-primary">Upload</button>
</form>
<div id="output" class="mt-4"></div>
<div id="umlDisplay" class="mt-4"></div>
</div>
<script src="{{ url_for('static', filename='script.js') }}"></script>
</body>
</html>
我确实尝试将轮廓设置为“无”并将框阴影设置为“框阴影”，但这没有用。我在这里看到了针对移动设备的相同解决方案，但我还没有看到针对非移动设备的任何解决方案，除非我是盲人。我还刷新了页面和应用程序。我还尝试了不同的浏览器，因为我目前使用的是 Firefox。
您还需要在 css 文件中的颜色中添加 !important 。所以按钮的外观将是正确的。
.btn-primary {
background-color: #fc3e00 !important;
border: none;
border-radius: 5px;
transition: background-color 0.3s ease, transform 0.2s ease;
color: white;
appearance: none;
}
.btn-primary:hover {
background-color: #b80c09 !important;
}
.btn-primary:focus {
outline: none !important;
box-shadow: none !important;
background-color: #b80c09 !important;
}
.btn-primary:active {
background-color: #b80c09 !important;
transform: scale(0.95);
box-shadow: none !important;
} <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap Link -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<!-- CSS Link -->
<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
<!-- Font Link -->
<link href="https://fonts.googleapis.com/css?family=Roboto+Mono:100,100i,300,300i,400,400i,500,500i,700,700i"
rel="stylesheet"/>
<!-- Project Name -->
<title>Viewie - Source Code Visualizer</title>
</head>
<body>
<div class="container">
<h1 class="text-center mt-4">Welcome to Viewie: A Code Source Visualizer!</h1>
<h2 class="text-center mt-4">Input your Python, Javascript, or Java Code :D</h2>
<form id="codeForm" class="mt-4">
<div class="form-group">
<textarea class="form-control" id="code" rows="10" placeholder="Please upload your source code :)"></textarea>
</div>
<button type="submit" class="btn btn-primary">Upload</button>
</form>
<div id="output" class="mt-4"></div>
<div id="umlDisplay" class="mt-4"></div>
</div>
<script src="{{ url_for('static', filename='script.js') }}"></script>
</body>
</html>