HTML+CSS 星空闪烁登录页面

效果

完整代码

<div class="container">
        <div class="stars"></div>
        <div class="top-right">
            <a href="#">Sign Up</a>
        </div>
        <div class="form-container">
            <h2>登录</h2>
            <form>
                <input type="email" placeholder="Email" required>
                <input type="password" placeholder="Password" required>
                <button type="submit">登录</button>
            </form>
            <a href="#" class="forgot-password">忘记密码？</a>
        </div>

    </div>

<style>
        body,
        html {
            height: 100%;
            margin: 0;
            font-family: Arial, sans-serif;
            overflow: hidden;
        }

        .container {
            background-image: url('./banner.jpg');
            background-size: cover;
            background-position: center;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .stars {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        .star {
            position: absolute;
            width: 2px;
            height: 2px;
            background: white;
            border-radius: 50%;
            animation: twinkle 5s infinite;
        }

        @keyframes twinkle {
            0% {
                opacity: 0;
            }

            50% {
                opacity: 1;
            }

            100% {
                opacity: 0;
            }
        }

        .form-container {
            background-color: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            padding: 2rem;
            border-radius: 10px;
            width: 320px;
            text-align: center;
            z-index: 1;
        }

        h2 {
            color: white;
            margin-bottom: 1.5rem;
        }

        input {
            width: 100%;
            padding: 0.75rem;
            margin-bottom: 1rem;
            border: none;
            border-radius: 5px;
            box-sizing: border-box;
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
        }

        input::placeholder {
            color: rgba(255, 255, 255, 0.7);
        }

        button {
            width: 100%;
            padding: 0.75rem;
            border: none;
            border-radius: 5px;
            background-color: #0e7ded;
            color: white;
            cursor: pointer;
            font-weight: bold;
        }

        .forgot-password {
            color: white;
            text-decoration: none;
            font-size: 0.9rem;
            margin-top: 1rem;
            display: inline-block;
        }

        .top-right {
            position: absolute;
            top: 1rem;
            right: 1rem;
            z-index: 2;
        }

        .top-right a {
            color: white;
            text-decoration: none;
            margin-left: 1rem;
            font-size: 0.9rem;
        }

        .bottom-text {
            position: absolute;
            bottom: 1rem;
            left: 50%;
            transform: translateX(-50%);
            color: white;
            font-size: 0.8rem;
            z-index: 2;
        }
    </style>

<script>
        function createStars() {
            const starsContainer = document.querySelector('.stars');
            const starCount = 100;

            for (let i = 0; i < starCount; i++) {
                const star = document.createElement('div');
                star.classList.add('star');
                star.style.left = `${Math.random() * 100}%`;
                star.style.top = `${Math.random() * 100}%`;
                star.style.animationDelay = `${Math.random() * 5}s`;
                starsContainer.appendChild(star);
            }
        }

        createStars();
    </script>

综上：效果实现啦！