炫酷的CSS3响应式表单

原创YouTube@ Online Tutorials

css代码：

* {

    margin: 0;

    padding: 0;

    box-sizing: border-box;

    font-family: 'Poppins', sans-serif;

}

body {

    display: flex;

    justify-content: center;

    align-items: center;

    min-height: 100vh;

    background: #03080a;

}

.container {

    width: 80%;

    padding: 20px;

}

.container h2 {

    width: 100%;

    color: #45f3ff;

    font-size: 36px;

    text-align: center;

    margin-bottom: 10px;

}

.container .row100 {

    position: relative;

    width: 100%;

    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));

}

.container .row100 .col {

    position: relative;

    width: 100%;

    padding: 0 10px;

    margin: 30px 0 10px;

    transition: 0.5s;

}

.container .row100 .inputBox {

    position: relative;

    width: 100%;

    height: 40px;

    color: #45f3ff;

}

.container .row100 .inputBox input,

.container .row100 .inputBox textarea {

    position: absolute;

    width: 100%;

    height: 100%;

    background: transparent;

    box-shadow: none;

    border: none;

    outline: none;

    font-size: 18px;

    padding: 0 10px;

    z-index: 1;

    color: #000;

}

.container .row100 .inputBox .text {

    position: absolute;

    top: 0;

    left: 0;

    line-height: 40px;

    font-size: 18px;

    padding: 0 10px;

    display: block;

    transition: 0.5s;

    pointer-events: none;

}

.container .row100 .inputBox input:focus+.text,

.container .row100 .inputBox input:valid+.text {

    top: -35px;

    left: -10px;

}

.container .row100 .inputBox .line {

    position: absolute;

    bottom: 0;

    display: block;

    width: 100%;

    height: 2px;

    background-color: #45f3ff;

    transition: 0.5s;

    border-radius: 2px;

    pointer-events: none;

}

.container .row100 .inputBox input:focus~.line,

.container .row100 .inputBox input:valid~.line {

    height: 100%;

}

.container .row100 .inputBox .textarea {

    position: relative;

    width: 100%;

    height: 100px;

    padding: 10px 0;

}

.container .row100 .inputBox textarea {

    height: 100%;

    resize: none;

    /* background-color: #000; */

}

.container .row100 .inputBox textarea:focus+.text,

.container .row100 .inputBox textarea:valid+.text {

    top: -35px;

    left: -10px;

}

.container .row100 .inputBox textarea:focus~.line,

.container .row100 .inputBox textarea:valid~.line {

    height: 100%;

}

input[type="submit"] {

    border: none;

    padding: 7px 35px;

    cursor: pointer;

    /* outline設置边框样式 */

    outline: none;

    background-color: #45f3ff;

    color: #000;

    font-size: 18px;

    border-radius: 2px;

}

html源码：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>

    <link rel="stylesheet" href="index.css">

</head>

<body>

    <div class="container">

        <h2>Contact Us</h2>

        <div class="row100">

            <div class="col">

                <div class="inputBox">

                    <input type="text" required="required">

                    <span class="text">First Name</span>

                    <span class="line"></span>

                </div>

            </div>

            <div class="col">

                <div class="inputBox">

                    <input type="text" required="required">

                    <span class="text">Last Name</span>

                    <span class="line"></span>

                </div>

            </div>

        </div>

        <div class="row100">

            <div class="col">

                <div class="inputBox">

                    <input type="text" required="required">

                    <span class="text">Email</span>

                    <span class="line"></span>

                </div>

            </div>

            <div class="col">

                <div class="inputBox">

                    <input type="text" required="required">

                    <span class="text">Mobile</span>

                    <span class="line"></span>

                </div>

            </div>

        </div>

        <div class="row100">

            <div class="col">

                <div class="inputBox textarea">

                    <textarea required="required"></textarea>

                    <span class="text">Type your message Here...</span>

                    <span class="line"></span>

                </div>

            </div>

        </div>

        <div class="row100">

            <div class="col">

                <input type="submit" value="Send">

            </div>

        </div>

    </div>

</body>

</html>

效果展示：

自适应效果:

巴特西

炫酷的CSS3响应式表单

css代码：

html源码：

效果展示：

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