如何实现.preloader div下滑隐藏且不产生页面滚动条及底部多余留白

解决方案 #

修改以下几处即可同时实现2秒延时启动、下滑隐藏、无滚动条无留白的效果：

1. 给html、body加横向溢出隐藏规则，避免元素位移触发滚动条
2. 调整preloader动画参数，增加2秒启动延时，动画结束后隐藏元素避免占用空间
3. 移除原HTML中多余的闭合标签，避免布局异常

修改后的代码 #

CSS部分

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
/* 新增规则，避免溢出滚动 */
html, body {
  overflow-x: hidden;
}
body {
  font-family: "Poppins", sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
  background-image: url('background_image_one.jpg');
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
}

.container {
  width: 50%;
  display: flex;
  justify-content: center;
  align-items: center; 
}

.card {
  transform-style: preserve-3d;
  background-color: rgba(0, 0, 0, 0.5); 
  border: white;
  border-style: solid;
  min-height: 60vh;
  width: 35rem;
  border-radius: 30px;
  padding: 0rem 5rem;
  box-shadow: 0 20px 20px rgba(0, 0, 0, 0.2), 0px 0px 50px rgba(0, 0, 0, 0.2);
}

.avatar {
  min-height: 35vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.avatarimg {
  width: 40rem;
  z-index: 2;
  transition: all 0.75s ease-out;
}


.info h1 {
  font-size: 3rem;
  transition: all 0.75s ease-out;
  display: flex;
  justify-content: center;
  color: white;
}
.info h3 {
  font-size: 1.3rem;
  padding: 2rem 0rem;
  color: #585858;
  font-weight: lighter;
  transition: all 0.75s ease-out;
}
.sizes {
  display: flex;
  justify-content: space-evenly;
  transition: 0.5s ease-out;
  padding-bottom: 2rem;
}
.sizes button {
  box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  font-weight: bold;
  width: 100%;
  padding: 1rem 0rem ;
  background: #f54642;
  border: none;
  color: white;
  border-radius: 30px;
  font-weight: bolder;
  margin: 1rem;
  
}
button.active {
  background: #585858;
  color: white;
}
.purchase {
  margin-top: 5rem;
  transition: all 0.75s ease-out;
}

input[type="text"], input[type="password"] {
  border: none;
  border-bottom: 0px;
  background: rgba(255, 255, 255, 0.2);
  color: whitesmoke;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  outline: none;
  height: 40px;
  width: 100%;
  font-size: 16px;
  transition: all 0.75s ease-out;
}

.forminput p {
  font-size: 18px;
  color: white;
}

.forminput {
  padding-bottom: 3rem;
}

.preloader {
  background: #000823 url("bold-preloader.gif") no-repeat center center; 
  min-height: 100vh;
  height: 100vh;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  /* 调整动画：动画时长1秒，2秒后启动，保持结束状态，可自行修改第一个参数调整动画速度 */
  animation: slide 1s ease-out 2s forwards;
}

@keyframes slide{
  0% {
    transform: translateY(0);
    visibility: visible;
  }
  100%{
    transform: translateY(100vh);
    visibility: hidden;
    pointer-events: none;
  }
}

HTML部分

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>3d Card Effect</title>
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="./style.css">
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
</head>
<body>
    <div class="preloader">
    </div>
    <div class="container">
        <div class="card">
            <div class="avatar">
                <div class="circle"></div>
                <img src="./userAvatar.png" alt="avatarimg" class="avatarimg">
            </div>
            <div class="info">
                <h1 class="title">Log In</h1>
                <div class="forminput">
                    <p>Email:</p>
                    <input type="text" name="" placeholder="">
                    <p>Password:</p>
                    <input type="password" name="" placeholder="">
                </div>
            </div>
            <div class="sizes">
                <button>Login</button>
                <button>Register</button>
            </div>
        </div>
    </div>
    <script src="./app.js"></script>
</body>
</html>

内容的提问来源于stack exchange，提问作者user14764548