CSS 线条流转 login

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        *{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body{
            display: flex;
            /*flex-direction: column;*/
            justify-content: center;
            align-items: center;
            min-height: 100px;
            height: 720px;
            background: #23242a;
        }
        .box{
            position: relative;
            width: 380px;
            height: 420px;
            /*margin-top: 100px;;*/
            background: #1c1c1c;
            border-radius: 8px;
            overflow: hidden;
        }
        .box::before{
            content: "";
            position: absolute;
            top: -50%;
            left: -50%;
            width: 380px;
            height: 420px;
            transform-origin: bottom right;
            background: linear-gradient(0deg, transparent,#45f3ff,#45f3ff);
            animation: animate 6s linear infinite;
        }
        .box::after{
            content: "";
            position: absolute;
            top: -50%;
            left: -50%;
            width: 380px;
            height: 420px;
            transform-origin: bottom right;
            background: linear-gradient(0deg, transparent,#45f3ff,#45f3ff);
            animation: animate 6s linear infinite;
            animation-delay: -3s;
        }
        @keyframes animate {
            0%{
                transform: rotate(0deg);
            }
            100%{
                transform: rotate(360deg);
            }
        }
        .form{
            position: absolute;
            inset: 2px;
            background: #28292d;
            border-radius: 8px;
            padding: 50px 40px;
            z-index: 10;
            display: flex;
            flex-direction: column;
        }
        .inputBox{
            position: relative;
            width: 300px;
            margin-top: 35px;
        }
        .form h2{
            color: #45f3ff;
            font-weight: 500;
            text-align: center;
            letter-spacing: 0.1em;
        }
        .inputBox input{
            position: relative;
            width: 300px;
            padding: 20px 10px 10px;
            background: transparent;
            border: none;
            outline: crimson;
            color: #23242a;
            font-size: 1em;
            z-index: 10;
            letter-spacing: 0.05em;
        }
        .inputBox span{
            position: absolute;
            left: 0;
            padding: 20px 0 10px;
            font-size: 1em;
            color: #8f8f8f;
            pointer-events: none;
            letter-spacing: 0.05em;
            transition: 0.5s;
        }
        .inputBox input:valid ~ span,
        .inputBox input:focus ~ span
        {
            color: #45f3ff;
            transform: translateX(0px) translateY(-34px);
            font-size: 0.75em;
        }
        .inputBox i{
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: #45f3ff;
            border-radius: 4px;
            transition: 0.5s;
            pointer-events: none;
            z-index: 9;
        }
        .inputBox input:valid ~ i,
        .inputBox input:focus ~ i{
            height: 44px;
        }
        .links{
            display: flex;
            justify-content: space-between;
        }
        .links a{
            margin: 10px 0;
            font-size: 0.75em;
            color: #8f8f8f;
            text-decoration: none;
        }
        .links a:hover,
        .links a:nth-child(2){
            color: #45f3ff;
        }
        input[type="submit"] {
            border: none;
            outline: none;
            background: #45f3ff;
            padding: 11px 35px;
            width: 100px;
            margin-top: 10px;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
        }
    style>

    script>
head>
<body>
<div class="box">
    <div class="form">
        <h2>Sign inh2>
        <div class="inputBox">
            <input type="text" required="required">
            <span>Usernamespan>
            <i>i>
        div>
        <div class="inputBox">
            <input type="password" required>
            <span>Passwordspan>
            <i>i>
        div>
        <div class="links">
            <a href="#">Forgot Passworda>
            <a href="#">Sign upa>
        div>
        <input type="submit" value="login">input>
    div>
div>
body>
html>
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在这里插入图片描述

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原文地址：https://blog.csdn.net/weixin_43229819/article/details/127351361