第四天，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>Efeito hover</title> <link rel="stylesheet" type="text/css" href="style.css"> </head> <body> <button class="btn">Desafio 30 dias CSS</button> </body> </html>

            
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            * 
{
    margin: 0;
    padding: 0;
    font-family: "montserrat", sans-serif;
}

body 
{
    background: #353b48;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn 
{
    width: 200px;
    height: 60px;
    background: none;
    border: 4px solid;
    color: pink;
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    font-size: 16px;
    position: relative;
}

.btn::before, .btn::after
{
    content: "";
    position: absolute;
    width: 14px;
    height: 4px;
    background: #353b48;
    transform: skewX(50deg);
    transition: .4s linear;
}
.btn::before
{
    top: -4px;
    left: 10%;
}
.btn::after
{
    bottom: -4px;
    right: 10%;
}
.btn:hover::before
{
    left: 80%;
}
.btn:hover::after
{
    right: 80%;
}