效果：
代码：
<!DOCTYPE html>
<html lang="zh-Hans">
<head>
<meta charset="UTF-8" />
<link rel="icon" type="image/svg+xml" href="/vite.svg" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>pdf-page-flip-viewer</title>
<style>
html,
body,
#app {
width: 100%;
height: 100%;
padding: 0;
margin: 0;
background-color: #ffffff;
}
.first-loading-wrap {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
width: 100%;
height: 100%;
}
.first-loading-wrap > h1 {
font-size: 128px;
}
.first-loading-wrap .loading-wrap {
display: flex;
align-items: center;
justify-content: center;
padding: 98px;
}
.dot {
position: relative;
box-sizing: border-box;
display: inline-block;
width: 32px;
height: 32px;
font-size: 32px;
transform: rotate(45deg);
animation: ant-rotate 1.2s infinite linear;
}
.dot i {
position: absolute;
display: block;
width: 14px;
height: 14px;
background-color: #1890ff;
border-radius: 100%;
opacity: 0.3;
transform: scale(0.75);
transform-origin: 50% 50%;
animation: ant-spin-move 1s infinite linear alternate;
}
.dot i:nth-child(1) {
top: 0;
left: 0;
}
.dot i:nth-child(2) {
top: 0;
right: 0;
animation-delay: 0.4s;
}
.dot i:nth-child(3) {
right: 0;
bottom: 0;
animation-delay: 0.8s;
}
.dot i:nth-child(4) {
bottom: 0;
left: 0;
animation-delay: 1.2s;
}
@keyframes ant-rotate {
to {
transform: rotate(405deg);
}
}
@keyframes ant-spin-move {
to {
opacity: 1;
}
}
</style>
</head>
<body>
<div id="app">
<div class="first-loading-wrap">
<div class="loading-wrap">
<span class="dot dot-spin">
<i></i>
<i></i>
<i></i>
<i></i
></span>
</div>
</div>
</div>
<script type="module" src="/src/main.ts"></script>
</body>
</html>