HTML登录页设计，HTML代码在线实时编辑、实时预览

index.html

style.css

index.js

            
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            <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="./style.css">
  <script src="./index.js"></script>
</head>

<body>
  <div class="container">
    <div class="form-box login">
      <form action="#">
        <h1>Login</h1>
        <div class="input-box">
          <input type="text" placeholder="Username" required>
          <i class='bx bxs-user'></i>
        </div>
        <div class="input-box">
          <input type="password" placeholder="Password" required>
          <i class='bx bxs-lock-alt'></i>
        </div>
        <div class="forgot-link">
          <a href="#">Forgot Password?</a>
        </div>
        <button type="submit" class="btn">Login</button>
        <p>or login with social platforms</p>
        <div class="social-icons">
          <a href="#"><i class='bx bxl-google'></i></a>
          <a href="#"><i class='bx bxl-facebook'></i></a>
          <a href="#"><i class='bx bxl-github'></i></a>
          <a href="#"><i class='bx bxl-linkedin'></i></a>
        </div>
      </form>
    </div>

    <div class="form-box register">
      <form action="#">
        <h1>Registration</h1>
        <div class="input-box">
          <input type="text" placeholder="Username" required>
          <i class='bx bxs-user'></i>
        </div>
        <div class="input-box">
          <input type="email" placeholder="Email" required>
          <i class='bx bxs-envelope'></i>
        </div>
        <div class="input-box">
          <input type="password" placeholder="Password" required>
          <i class='bx bxs-lock-alt'></i>
        </div>
        <button type="submit" class="btn">Register</button>
        <p>or register with social platforms</p>
        <div class="social-icons">
          <a href="#"><i class='bx bxl-google'></i></a>
          <a href="#"><i class='bx bxl-facebook'></i></a>
          <a href="#"><i class='bx bxl-github'></i></a>
          <a href="#"><i class='bx bxl-linkedin'></i></a>
        </div>
      </form>
    </div>

    <div class="toggle-box">
      <div class="toggle-panel toggle-left">
        <h1>Hello, Welcome!</h1>
        <p>Don't have an account?</p>
        <button class="btn register-btn">Register</button>
      </div>

      <div class="toggle-panel toggle-right">
        <h1>Welcome Back!</h1>
        <p>Already have an account?</p>
        <button class="btn login-btn">Login</button>
      </div>
    </div>
  </div>
</body>

</html>

            
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*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
    text-decoration: none;
    list-style: none;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(90deg, #e2e2e2, #c9d6ff);
}

.container{
    position: relative;
    width: 850px;
    height: 550px;
    background: #fff;
    margin: 20px;
    border-radius: 30px;
    box-shadow: 0 0 30px rgba(0, 0, 0, .2);
    overflow: hidden;
}

    .container h1{
        font-size: 36px;
        margin: -10px 0;
    }

    .container p{
        font-size: 14.5px;
        margin: 15px 0;
    }

form{ width: 100%; }

.form-box{
    position: absolute;
    right: 0;
    width: 50%;
    height: 100%;
    background: #fff;
    display: flex;
    align-items: center;
    color: #333;
    text-align: center;
    padding: 40px;
    z-index: 1;
    transition: .6s ease-in-out 1.2s, visibility 0s 1s;
}

    .container.active .form-box{ right: 50%; }

    .form-box.register{ visibility: hidden; }
        .container.active .form-box.register{ visibility: visible; }

.input-box{
    position: relative;
    margin: 30px 0;
}

    .input-box input{
        width: 100%;
        padding: 13px 50px 13px 20px;
        background: #eee;
        border-radius: 8px;
        border: none;
        outline: none;
        font-size: 16px;
        color: #333;
        font-weight: 500;
    }

        .input-box input::placeholder{
            color: #888;
            font-weight: 400;
        }
    
    .input-box i{
        position: absolute;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        font-size: 20px;
    }

.forgot-link{ margin: -15px 0 15px; }
    .forgot-link a{
        font-size: 14.5px;
        color: #333;
    }

.btn{
    width: 100%;
    height: 48px;
    background: #7494ec;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, .1);
    border: none;
    cursor: pointer;
    font-size: 16px;
    color: #fff;
    font-weight: 600;
}

.social-icons{
    display: flex;
    justify-content: center;
}

    .social-icons a{
        display: inline-flex;
        padding: 10px;
        border: 2px solid #ccc;
        border-radius: 8px;
        font-size: 24px;
        color: #333;
        margin: 0 8px;
    }

.toggle-box{
    position: absolute;
    width: 100%;
    height: 100%;
}

    .toggle-box::before{
        content: '';
        position: absolute;
        left: -250%;
        width: 300%;
        height: 100%;
        background: #7494ec;
        /* border: 2px solid red; */
        border-radius: 150px;
        z-index: 2;
        transition: 1.8s ease-in-out;
    }

        .container.active .toggle-box::before{ left: 50%; }

.toggle-panel{
    position: absolute;
    width: 50%;
    height: 100%;
    /* background: seagreen; */
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2;
    transition: .6s ease-in-out;
}

    .toggle-panel.toggle-left{ 
        left: 0;
        transition-delay: 1.2s; 
    }
        .container.active .toggle-panel.toggle-left{
            left: -50%;
            transition-delay: .6s;
        }

    .toggle-panel.toggle-right{ 
        right: -50%;
        transition-delay: .6s;
    }
        .container.active .toggle-panel.toggle-right{
            right: 0;
            transition-delay: 1.2s;
        }

    .toggle-panel p{ margin-bottom: 20px; }

    .toggle-panel .btn{
        width: 160px;
        height: 46px;
        background: transparent;
        border: 2px solid #fff;
        box-shadow: none;
    }

@media screen and (max-width: 650px){
    .container{ height: calc(100vh - 40px); }

    .form-box{
        bottom: 0;
        width: 100%;
        height: 70%;
    }

        .container.active .form-box{
            right: 0;
            bottom: 30%;
        }

    .toggle-box::before{
        left: 0;
        top: -270%;
        width: 100%;
        height: 300%;
        border-radius: 20vw;
    }

        .container.active .toggle-box::before{
            left: 0;
            top: 70%;
        }

        .container.active .toggle-panel.toggle-left{
            left: 0;
            top: -30%;
        }

    .toggle-panel{ 
        width: 100%;
        height: 30%;
    }
        .toggle-panel.toggle-left{ top: 0; }
        .toggle-panel.toggle-right{
            right: 0;
            bottom: -30%;
        }

            .container.active .toggle-panel.toggle-right{ bottom: 0; }
}

@media screen and (max-width: 400px){
    .form-box { padding: 20px; }

    .toggle-panel h1{font-size: 30px; }
}

            
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            const container = document.querySelector('.container');
const registerBtn = document.querySelector('.register-btn');
const loginBtn = document.querySelector('.login-btn');

registerBtn.addEventListener('click', () => {
    container.classList.add('active');
})

loginBtn.addEventListener('click', () => {
    container.classList.remove('active');
})

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