前端动画（无废话）
html 主体
我要评论 <div class="wrapper"> <div class="input-data"> <input type="text" required> <div class="underline"></div> <label>输入</label> </div> </div> css 样式
* { margin: 0; padding: 0; outline: none; box-sizing: border-box; font-family: "Poppins", sans-serif; } body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(-135deg, #c850c0, #4158d0); } .wrapper { width: 450px; background: #fff; padding: 30px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); } .wrapper .input-data { height: 40px; width: 100%; position: relative; } .wrapper .input-data input { height: 100%; width: 100%; border: none; font-size: 17px; border-bottom: 2px solid silver; } .input-data input:focus~label,
.input-data input:valid~label { transform: translateY(-20px); font-size: 15px; color: #ff0000; } .wrapper .input-data label { position: absolute; bottom: 10px; left: 0; color: grey; pointer-events: none; transition: all 0.3s ease; } .wrapper .input-data .underline { position: absolute; bottom: 0px; height: 2px; width: 100%; } .input-data .underline:before { position: absolute; content: ""; height: 100%; width: 100%; background: #ff0000; transform: scaleX(0); transition: transform 0.5s ease; } .input-data input:focus~.underline:before,
.input-data input:valid~.underline:before { transform: scaleX(1); } 本文地址：https://blog.csdn.net/qq_43562262/article/details/107889525
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