第十六天，HTML/Vue代码在线实时编辑、预览

<!DOCTYPE html> <html lang="pt-br"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Botão - desafio 16 </title> </head> <body> <a href="#">挑战 CSS</a> </body> </html>

            
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            body
{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #222;
}
a {
    text-decoration: none;
    color: white;
    font-family: sans-serif;
    font-size: 40px;
    border: 3px solid white;
    padding: 40px 80px;
    position: relative;
    transition: all 1s;
    overflow: hidden;
}

a:before {
    content: '✔️ 第 16 天';
    color: rgb(0, 90, 0);
    background-color: #c1f1c8f6;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    transform: translateY(-100%);
    transition:all .5s;
}

a:hover:before {
    transform: translateY(0);
}