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HTML

<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Botão animado</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }

body{
            width: 100vw;
            height: 100vh;
            background: rgb(0, 0, 0);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

/* botão com cor de fundo snow, imagem de fundo de captura com tamanho inicial 0 e borrão de 2px*/
        button{
            border-radius: 10px;
            outline: none;
            border: none;
            width: 150px;
            height: 50px;
            background-color: snow;
     background-image: url("https://byby-inc.github.io/css-animations/capture.svg");
            background-size: 0;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            font-family: monospace;
            filter: blur(2px);
        }
        /* barra de scan dentro do botão com animação scan e invisivel por enquanto*/
        button:hover div{
            content: "";
            width: 100%;
            height: 2px;
            position: absolute;
            visibility: hidden;
            top: 0;
            z-index: 1;
            left: 0;
            background-color: rgb(0, 0, 0);
            animation: scan 2s linear infinite;
            animation-delay: 1s;
        }
        /* animação do botão para capturar */
        button:hover{
            animation: focus 1s linear forwards;

}
        /* efeito de piscar para ficar igual captura e tirar o borrão no final */
        @keyframes focus{
            0%{
              background-size: 140px 40px;
            }
            20%{
                background-size: 0;
            }
            24%{
                background-size: 140px 40px;
            }
            30%{
                background-size: 0;
            }

100%{
                background-size: 140px 40px;
                filter: blur(0);
            }
        }
        /* efeito simples de scan, e deixando a barra visivel*/
        @keyframes scan{
            0%{
                visibility: visible;

}
            50%{
                transform: translateY(50px);
            }
    
        }
    </style>
</head>
<body>
    
    <button>
    <div></div>
    SCAN BTN 1
    </button>
    
</body>
</html>

CSS